Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d04fc029dd85c…

MALICIOUS

PDF

97.2 KB Created: 2021-09-12 07:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 402de17570b3d75c9a0cf02d1ac8249c SHA-1: af6c8755117ae7afdd8c514d6a3bd38dbc00bedc SHA-256: b64d04fc029dd85c393a258c4a67101a6605f40cdbcb88e67ff20656215dc283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=dragon+ball+z+android+8 PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb845d821---28156573083.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6e8cb201---bomegil.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/rewifazikijubu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/vukuzojibo.pdfIn PDF document text
    • http://c-amc.com/upload/files/negefejijesinemojizobu.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109050349585512.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/69081502550.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/69666364558.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/luzedipinivadupe.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/mifikizazenikagudivow.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/96877727182.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/pegutixaxawuperon.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gexunaxusexemunali.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/21455331241.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52383635265.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/70040951032.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/repopezotobixuxoson.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/2754894728.pdfIn PDF document text
    • http://gojjang.com/uploads/files/6032302225.pdfIn PDF document text
    • http://opersan.com/file/fibadajexiwezidejod.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/93350236e504444b1332a3b6497485bf/welepewapuzagetixavugur.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109031930087884.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e7cf21f6d7babbece3a7b99aff5c923a/jezowuve.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/33511461611.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_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 10436 bytes
SHA-256: 9a82e792efd72f77bef371fc6b6c8e0f73ef01f1f5d44846b5b1107d583b0871
font_01_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 19868 bytes
SHA-256: 1051822abdd8d35cbc8f7801d9b8993e4e9f65922385f393aecdf468dd8798d7

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