Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d4f891290f9db4…

MALICIOUS

PDF

94.6 KB Created: 2021-08-25 20:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52d2ae5cc37562e3e4a81099437b3c60 SHA-1: bafcb849a282794af9be709e2a5751c2ac196bf7 SHA-256: b3d4f891290f9db4585c7b1012efb1cae9b98ade0dd9405b2d1da7bffea36926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://queure.ru/uplcv?utm_term=perfume+compound+nyt+crossword PDF link annotation
    • http://dostavkaturov.ru/files/file/sopulebegakotoje.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/nilokekip.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17a2f2959---wixed.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b99e337f4c9a96df7565f80fa235a5c1/naziworik.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3068b6ea8---tirurepudinapafuverewabex.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/puduvuwer.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/86154863831.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c8ed7bf2bf---59865534566.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tovapitisumikusiluve.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/nasekedelodumamorakor.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/1498818534.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/3744912742.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0d1262d9af50449cfc4141029b0c04d6/vojedisubugesobewi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81f78d68d---sowofezifipapevogibija.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/93082090778.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fd9f2f533cf6c2ad5cefd4330b991753/guvomatexabaz.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f937a82ae6---65766056024.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d84328ec2a68fb39c20fc6db3aceb523/98702121394.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7957e510---lobarizametumuzaravizape.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08499d3da---ropupigabepezojax.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kuzaruwixawizutor.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/47808103422.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c727e1b8ed5---91539348316.pdfIn PDF document text
    • https://magatek.com/documents/file/53531362528.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/wozozarubilamajojokanavan.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1f4cb49af232bed2ab86bf52f2db3c5/devanimikavojavuzodu.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_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 17688 bytes
SHA-256: 201d6db7fd7d4ae9597c26d8b00d03c12fcdeb514640b45e234ddac1b8077c81
font_02_sfnt_off0001523a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523A 10780 bytes
SHA-256: d1bca159f460718597e542dbdd6190d3de92a540813ea0a6fbd5ee47a7ec1991

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