Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71acc696e8f1022…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 18:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28e83397a303f09ce653265a7b678d15 SHA-1: 95af3e35daaacd8d4a7712cfecae3c62d1f11f49 SHA-256: d71acc696e8f10224c7d739c557e69d7f44e23728f8e03426cb5baca96c26af8
184 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious payloads. Heuristics indicate the presence of a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://fond.ru/userfiles/file/19540411939.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60565877032.pdfIn PDF document text
    • https://ka-base.no/images_content/file/62320193363.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613427228e739---nemoxama.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/latunukasexolelix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134609bc1095---noxazebararegebabutak.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lemovijizej.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/supawaseleguz.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/60498152447.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/japijolol.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badadowin.pdfIn PDF document text
    • http://btfa.tw/upload/files/48997924571.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191121338221.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/fopive.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/59218536640.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/tonazenemitixaz.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97029090982.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132df3a145b2---39989304977.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/82548547949.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/8094584034.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gukigowos.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f582926848---66368643180.pdfIn PDF document text
    • http://zaiger.ru/img/file/16122833725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+charge+something+with+a+broken+portPDF link annotation
    • 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 17056 bytes
SHA-256: c510c1d03ee6c99d696fe00411be32c3e9a11de31e79862e59a9f1c3af7c74d0
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 11084 bytes
SHA-256: 27739f1c06253a2ff8ef9121ae2171ac44d99be2dc9611b232467e8c566a9750
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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