Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1344c78cd694e3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 15:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1273446a344bb87de739459ffde94a1d SHA-1: 66b48eabb628375e0f0223961d0d20e9f077fc45 SHA-256: fb1344c78cd694e34b43bcecffa39bc58f5cf8d45abeb04fb50a02816e1aec9f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'callback phishing phone lure' heuristic further indicates a potential social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=lemonade+mouth+streaming+vf PDF link annotation
    • http://modern-pro.ru/files/file/40805568742.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd86aef8d---tixupedatebovulalevuj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/86653893451.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vanezemupabuxatoz.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/72046273621.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kufidegizej.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mixipemovoruv.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/pimebekumov.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fufizof.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/3324684165.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146771c9460e---marevetoxewiwurefi.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/pabizugipuvidawilumugu.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/38686845486.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/3955826748.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/57626927101.pdfIn PDF document text
    • http://juncheng.tw/upload/files/kagidomitasatavekomeg.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jg3rif9b1ecf5l53da3jhcn9if/runozipebikojazafo.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/86873178006.pdfIn PDF document text
    • http://wernitznigg.at/files/winogot.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/jopuzamekuz.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/44158732659.pdfIn PDF document text
    • http://aprt1day.ru/file/sodidomilirut.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bexemurobowebawute.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/vinisegabogorabibepo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614371442a31b---bavokatakofelolalozu.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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 17692 bytes
SHA-256: 7e1bffa172dace4abde6f7055e870eb39f5ea76ea306037e7e4ffd216a127d47
font_02_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 10880 bytes
SHA-256: d8da8382201c53f2b146768bbce797d184ca1be285d6945f859f689f262c4d8c

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