Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3770bb616fa741…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 17:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b32e7814857553d9484b5df64b3008a7 SHA-1: 941b6da3af41d1b2dc59605e45d91b797330661a SHA-256: dd3770bb616fa74117239b5afb704cc8697ca1ea2a48aa4b59969c2577635195
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some of which are hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing, as evidenced by the brand impersonation and urgency lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://crysiq.ru/uplcv?utm_term=nclex+rn+questions+and+answers+with+rationale.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=nclex+rn+questions+and+answers+with+rationale PDF link annotation
    • http://kadh.kr/bobod/upload/file/mefazobozipuje.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/91183641005.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5c557d1a69135469d62046cc0dc6ba8f/20370521720.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986b92fee---24715082776.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jiwizafulupom.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lebezojoratezexarulamir.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/fibovolobufuruw.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/35019156258.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7lmmmcb0hd6j9ib4v4mea180lo/wonomilosoxaworoje.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18325ddd89---62532209982.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/72332887987.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tbnq8hcj0ssvl1aask4b1j3o5d/taronuzodediduge.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/34698191319.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31ed3071c---vufulezugowoku.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/sejisozukukodewipuga.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nisemoxidapegozewevutewi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/94609581000.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9607ab7c52414a45ef4d7f0b90cc4938/dibigubisematoj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/61a9bcd1f654d4b70932d9875077fd31/xisezo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764124eb136---3146640931.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b9a1d58a---10842876454.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/48568784be3490162d8d9ec4d7d7b1b9/gozemiwikujo.pdfIn PDF document text
    • https://onlinendttraining.com/files/kezovogifafitisegap.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dubujoxotoxewuseli.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21078303707.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/47331119068.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 18260 bytes
SHA-256: 85e0b71faf08d87d3f14ac4b59ec9f026cf832ce3f47b48fa1b4d2d01ab09d70
font_02_sfnt_off00013e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 10876 bytes
SHA-256: 8bb9c50a56001a34def2ded3fbcf32ef415d70c80102e42cec32dbf7b0cd239b

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