Malicious PDF — malware analysis report

Static analysis result for SHA-256 673dc3875f1278d4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 15:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29f08e6cdd94585404f4668b14d19fa6 SHA-1: 4f031ebbdae002850f33ccc85ebdbefd9e88d418 SHA-256: 673dc3875f1278d4907a3e476343466a4e92df58156a56e6ea1bc8fb78ba286d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=irregular+comparison+of+adjectives+pdf PDF link annotation
    • http://to-tuong.com/media/ckfinder/files/87802842551.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074964b02890---62485404725.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nexisizurage.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/38659708868.pdfIn PDF document text
    • https://temahr.hr/files/61460767776.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/76766801865.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b536298cd---fenukibugovixepebuzoloso.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc073d3d70---4109747455.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b2588d770b441204f55cbaa024828718/42522913807.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/9824389336.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/6764456187.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/91557965540.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/847309225.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/6606935697.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b3f44a6e---kebuwoguzekekera.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6c58ce63e---bikilufupegodirexum.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5412d8ed4b---98270390609.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b28s8o30q2015n58608b9qqaf5/lolazikumoxizasiv.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/68233702377.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/88463080435.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124e79592f33---leluxasawoxavemorarig.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/vemupurizopefub.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/308bcg7bjnml8ln5t8tvctldff/tenikewobutepulunopix.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_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 19452 bytes
SHA-256: 13acd93c8383a5ee8b7588e2c85f101e8a039f7a11a4d5ac916551d40e922a11
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 11208 bytes
SHA-256: 6c3b0a3779822008c1346133106c97104ca56401c7bb92218438376b1b146029

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