Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6dc24060dc2724…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 08:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fe4a269a58d49476d4bc0437c8564e4e SHA-1: f2c36f3e879ce098c195e06335dd73743af148b9 SHA-256: ba6dc24060dc2724bf0fbfe24493073b207aa2b3a7e6a6122b34ef45660b7e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ecoretras.com/file/17036183736.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5e0e7eaf---38124712657.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c471ee63488---gimelepazasexenabiwaxusos.pdfIn PDF document text
    • http://liyangah.com/Upload/file/3701477291.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zukakutolojasamuwobuwax.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/587c147a311d406b8e313cf0066209c5/sumegosilodeluro.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/74296308211.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/v9nn5db7ivp0gdvvfiub3f1t1e/komejeposizazik.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/turupuvurowifotiripekipa.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d6na7bof759u2o4t9ss8i7lpl0/kojarewewivifapubulu.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/volilufogirukizafivor.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07199efcb3---judapu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c2075ebd---xejakevixivapovujapo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cad6f2e91---buputufeweli.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/totox.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/37437706669.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/37202918762.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/titomififuwofidiwo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e569b50c33---30491345994.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c696c01ee0---zipudumukemojebutefasex.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/47230419996.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/vivulibedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=thought+of+the+day+positive+thinkingPDF 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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16924 bytes
SHA-256: 73e48ffd52925fdd783496e2e74913cdcf88ca49a80173b412c9ec2f06ff727e
font_02_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 10964 bytes
SHA-256: 5bf0bb3b2f5b1ae8a365bcb96ba8c333631339cf8dc93c0ad5aa2a9e384463e3

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