Malicious PDF — malware analysis report

Static analysis result for SHA-256 36874220ff644f7c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 00:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5060d0372a2565f83e4abbf6bc8464f8 SHA-1: 17f104f48049f2a6f363447c6d2788a520e9f4dc SHA-256: 36874220ff644f7c9ac6c9e959db648292affe709795b299ffb0567f4ff6c959
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous URLs hosted on potentially compromised or disposable domains, which is a common tactic for distributing malicious content or conducting phishing operations. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://archism.ru/uplcv?utm_term=learning+months+of+the+year+worksheets PDF link annotation
    • http://www.lnk-creation.fr/upload/file/69694304241.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cba5b73c---netepukuvap.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vupikixad.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/38812c9d4ed87899b07fe611727c6184/28958725616.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/sojako.pdfIn PDF document text
    • http://jarosi.hu/files/file/46916807574.pdfIn PDF document text
    • https://saam.vn/images/content/file/67434796474.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/76fg0ml69e06j6lna2h7b7nfs1/62581209365.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072140734129---tufaxazijisodaw.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/94423431785.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/de993be8edf7c2b1a3e69b27f273a9d2/97900710073.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/nojawikurukadap.pdfIn PDF document text
    • http://jaika.in/images/documents/files/37579503867.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/025iq7m91dn5q13p4sumvq4va7/gasasikubidata.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69769631748.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wonupozobowovopekoxuvalaf.pdfIn PDF document text
    • http://ruihuitax.com/files/file/46864115766.pdfIn PDF document text
    • http://ccadl.com/files/20210708005112.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee2cdeb5b---jumozogaxusume.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845d8434292---nofefaxafujaxazineliwo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085539774828---sepuletetuporaratixema.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/bedotijevoromo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/8153039971.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607133856bdc0---89066501135.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/49841288082.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46c88ce0---40442233736.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/rikodaruve.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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17428 bytes
SHA-256: b48c4e4c806422a2569e7ff7d03ba221bab36c8ef1f53112f480967a1e07c06f
font_02_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 10864 bytes
SHA-256: 1843c78be5e880d2aa439f8566db3d65333af29083a8750f7641d628863435bb

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