Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1d07d301ec21cc…

MALICIOUS

PDF

88.4 KB Created: 2021-07-13 16:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe865e0b701b19b85ba49b4f253d0495 SHA-1: 07b1a0ba3837d274674d2c8f3c5568fa71f97c23 SHA-256: 4b1d07d301ec21ccfeb897b9b1e4f55a010bed3dae6f1b7587d1db247e4d5072
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised hosts. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73155ebff---seduxukosinazotilima.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a1801397f---ferolulukinijinexekeruj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d64ca9b46c9ac1f3552d22ee8d59fc9c/wijufalufopatederatowimu.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d6d8d7fd24e9e315230a82df1b5a33e9/xazeled.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/38534674872.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c23628567bc---duwuxusajofit.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14ec48a2f---64149338532.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524101105027.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8b66a789c017c2c00a8238364b59569b/motugusadaluxaveduvuzeb.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/60753337406.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/redegapojixukiwaresaben.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/97998030852.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/93075e39a457a7123736b36c47d09387/siwowizanuzomob.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/31045485552.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/41696353683.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c462829a9b5b61752fdaee3c623ceefa/kuwajaki.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609918a362364---77590188051.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607507beb130a---fubam.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jorik.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160748c6adc2e1---29420998810.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ca3ea375999e9786940bec59db04bd1d/maziwezopiseze.pdfIn PDF document text
    • https://wsbtitan.com/images/file/76237207285.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/k2n00aecda4k2onbstr3ihu2r5/tibodugabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cast+of+the+justice+leaguePDF 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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 16888 bytes
SHA-256: 58d5d9f25efb92a2757f74a75b0ced102b6b5b91e625b094d28e64a3e56f0f99
font_02_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 10672 bytes
SHA-256: 9e4e66e2439c3c1856f5b56107f34c2a34ce066a05e97fd2d52cb77ef23d105e