Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a812e0f563d8949…

MALICIOUS

PDF

85.4 KB Created: 2021-08-07 11:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9e6720a5ec0dbd45d238ccb5d68e1415 SHA-1: d171ed19b257ddbd63b9f6715b57c2be59987710 SHA-256: 4a812e0f563d8949ad462cd2e20dce5a657732b2a3107a5feb2ce3e17e99cbc6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates potential command execution, though the specific command is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ventadeterrenosurbanos.com/userfiles/file/42103081702.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5b9a6c53a---1491005092.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/xurexib.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/vupolobafase.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210626214219.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/191b4cf40a10b5ba5b4db110a586b4a3/24703862443.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kevimidumenogupinapol.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11210258072.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xezojewibejaba.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbgq09p9gt5qkuv97672ee9mns/44484910522.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/867513aad2c9b50d540ccc090f41fd33/wilidilogin.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/64125090988.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/48823784870.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c729944126---tuzofekiwelotu.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/feberiz.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/86926262581.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc6a9972d---ranizaxeluxija.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/14121865567.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/115916961.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/22320894593.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c94ae076bde008564f6eb338b4230fb6/xageletudulirurimubox.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733bd50546d---68324639771.pdfIn PDF document text
    • http://maihome.hu/admin1/file/venukadivaxafopumeduzo.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/fuzijexagiginawopo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c365b26d77bf97f88170a4d50469e24d/43765085451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=leadership+101+pdf+john+maxwellPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/aec8aeedd7e3d72c1c44217e9f4ede52/6314711499.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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 17200 bytes
SHA-256: 66529140f71eb944d3e3076b02529f1c0c707d7d7e2f012d27c9fa5a8295a886
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 11112 bytes
SHA-256: 404006cdde30913d929fb4859db2c4cb7b6e6534a69cc35a39458287269770a6

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