Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc220852265c995…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 07:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82e84e54a5ff0d4f73fe3ea1b26bfc70 SHA-1: 7bedf441eadc930c677fa5f4a3f9b3b0234b487f SHA-256: cdc220852265c995323f27e724859cdda2a5c0f65a358b53005fa6b0e3e6aa31
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent. The presence of heuristics like 'SE_REMOTE_SUPPORT_LURE' and 'SE_CALLBACK_LURE', along with ClamAV detection, strongly suggests a phishing or social engineering attack. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to malicious sites, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://garglob.ru/uplcv?utm_term=cast+mobile+screen+to+pc PDF link annotation
    • https://krassimirtaskov.com/userfiles/files/42874981099.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/93854469869.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/sejiganizidevavefuduxus.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawivaravamukijeferelav.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/lopavusobodak.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/90249279751.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/87962052298.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/75673751614.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/31412461693.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/13689725558.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/beriwanojomolezoxuru.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/20995708014.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/981105781612f2fcce2dc4.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/luxaru.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb1592d91---wudalupamuvumof.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613608ff20e43---73043600408.pdfIn PDF document text
    • https://fond.ru/userfiles/file/37390906582.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/murafas.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367956a42bd---69084829518.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/39159923817.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pukekajetisibes.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tanofemuzozexalipi.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 18116 bytes
SHA-256: 4367d0b240c562297b1bd36290b5d31c48d5262e7cccba4430d3e04a359f4888
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 10708 bytes
SHA-256: afcaecf55d7074e16b9e3c0fd397231c26f87878693a395d886c5f6797ed9960

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