Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c30536b4af31bf3…

MALICIOUS

PDF

76.6 KB Created: 2021-07-03 14:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc12e22904ec65d8421bfe1df873a0eb SHA-1: 860a7f876ab77184011c90fc3ebaaedc16d1d9d2 SHA-256: 7c30536b4af31bf3604b075ea65e74de47d2396ce5fdb157848158395407641a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings strongly suggest the document's purpose is to redirect users to these external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=rotate+about+the+origin+90+degrees PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812153ad138---5035772834.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/93811852326.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2248fb075d6edd20e6bc421ee2b40d0c/wozivuvukoborulerudopok.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce824d8213f---48605101057.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3dfacabe3d844c3ff94e15063a8aa47d/72346196048.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/78bb93114014406e101e40d8ef8ef3a4/20229071847.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lisusududomolo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607139c715ce1---56482214477.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f22e1f92---27717903335.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075adc71f92a---6284638068.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/43e548dd947c220a9ca60e2d35c5ccfd/pogazigevimefigosene.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/3096546680.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/glaffvkggmqscu3s611cgppgrk/kivajulufefopetoxiki.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nr9gc1860jln0lvfeul8p0vjbq/bofegixavokurodi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/didakise.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/69974006212.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/fcda024396d72cb1590bf900e0d2039e/begizorenetawafenoranili.pdfIn PDF document text
    • http://flexa.cz/docs/file/2859249990.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lezabusadug.pdfIn PDF document text
    • http://apcmagon.com/userfiles/bamukaku.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee104d5129---68850432856.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16090dcf77f344---dizaniwevamexela.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/wifilod.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/c1a9ffb4581f14623e22733eeceebd74/29322797345.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16980 bytes
SHA-256: 3621f17152f3bf837b95b805f346038635b702bda6e7a729cb22a6cbd93a7bd1
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 11056 bytes
SHA-256: ba436400963cf3c923ca092b1d4da6b9fdce019e38dbedb04d93735e95d6da09
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1