Malicious PDF — malware analysis report

Static analysis result for SHA-256 a682c66a06ff5d5e…

MALICIOUS

PDF

106.5 KB Created: 2021-10-05 05:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ddae2e8f7b6776ff98c0ac1c283748 SHA-1: b34579fff026c17d9dfa95355b966c942c4f03bd SHA-256: a682c66a06ff5d5e5c2e8f240bc107627f21c5e570148553331157d731b02ed4
184 Risk Score

Malware Insights

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://queure.ru/uplcv?utm_term=speaking+dell+hymes+tagalog
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xujoxasen.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/vobema.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/kilunibadifafupuxoviro.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/13432601433.pdf
    • https://hamayeshniroo.com/shop/file/natapazagagojok.pdf
    • https://csp-pub.com/stockages/files/31327382327.pdf
    • http://visusmarble.com/images_upload/files/56468946566.pdf
    • http://gaishachuukobuhin.com/js/upload/files/91934116768.pdf
    • https://huangs.tw/uploads/files/202109151019325831.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347f91cbf1e---2062392969.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/95634346716.pdf
    • https://lochoanggia.com/upload/files/4382782617.pdf
    • https://ibextrail.com/editor-images/50686601991.pdf
    • http://investgeorgia.ge/userfiles/file/44470136755.pdf
    • https://villadorottya.hu/uploads/frontend/files/33244827109.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/ruxokanakixasegemesuma.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d1ce65794dae6e2635315b64ad301d2/93309723869.pdf
    • https://silverbirdmarketing.com/pages/images/file/67047055195.pdf
    • http://www.ufolep-69.com/contenus/files/5840022368.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/29450595726.pdf
    • https://abcoegypt.com/userfiles/files/netuboniwuxa.pdf
    • https://diarch.in/WYSIWYGImage/file/32351407223.pdf
    • http://wonderpanel.com/app/webroot/img/file/97460278590.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d393472b1c2b884f56870baae0918e33/15396099287.pdf
    • https://cnn-logistics.com/asset/files/renokusitarawixodomis.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c727cd358f---17223542453.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c65.bin
a08c0f303a056aa88e29540907cc95eb373f3798c8b8eed1ca7a902c9f408e16
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 24508 bytes
font_01_sfnt_off00016a7e.bin
ad80e17b86b7e3e7b026563c7334c8fd306b644e183a78685c24f1c75352a8dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7E 11020 bytes
font_02_sfnt_off000183b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x183B6 16792 bytes