Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3f81c5fa1b758d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 06:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae58d50949b9cec085278eb9c9194aa4 SHA-1: 279dc4de80581e667aaa377f9ee9ff631a8d5e06 SHA-256: 7c3f81c5fa1b758d9e66812c7aa2e07da1eff97868f352b6d3c48a773a3cf22f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the embedded URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f0d7a5d1cc914f068025be38051d18fb/gidoratiwopazi.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/aabb6d6812b0775c15a7c36ecc98ac27/60616032367.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e978ac095---14184092360.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/riratokujetoxiwavuwilun.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/31171191472.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/46102649302.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/773001368.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a45fabe8b---kifavinoxirarusapaxelosu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9651251be---duwipitugurukukovu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/goduzewo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/konufafuluxavi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ldhiq3ek28e9uq4qq1gv137845/97312600286.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/95450718703.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/68481890469.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/11b36d63363d0039dec58f56240971a7/28091997556.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/nqetl7np69hfrtkvpfq3ni27ji/62725037659.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dd9adbee82669f6c03e7f3768690c13c/87195828659.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df766e2b204c88f273abe45977b64506/xosixagumu.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/zivujixomifajabuxase.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0fce8593---10567072820.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8e86f0b4---putaxajaparidakotavifug.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f318f169---nosiwaxunajepugotukabi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/sazugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=borderlands+2+character+editorPDF 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_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 18204 bytes
SHA-256: 51ea64a3105efb9f83101195ce5f77a08e55d28a0b18e9c1701eaaa26dc9966c
font_01_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 10640 bytes
SHA-256: bd74df4fd50ab0fcd14f2f20aea52f63eba76d3296eef4473b58162dab1ceda6
font_02_sfnt_off00014021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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