Malicious PDF — malware analysis report

Static analysis result for SHA-256 f776921579619649…

MALICIOUS

PDF

69.8 KB Created: 2021-06-27 00:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abb2fec09fe22ac333f6936c1785ad05 SHA-1: d7ed897d07cc6d36ab8fabeb8779c6ec5f8f42ea SHA-256: f776921579619649dccf486cef34b7df87a5cab685fcc7bbdaa89e0a7846318f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to phishing pages or download further malicious payloads, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the structure suggests a malicious PDF designed to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nomylo.ru/uplcv?utm_term=fluoxetine+and+digoxin PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b0447c51a01d268fb5827d0adcebe5dc/lotuvum.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5538697b---32551532619.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793563b8c46---morinekajesodulur.pdfIn PDF document text
    • https://csn-alliance.com/data/files/85364467957.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/56578696805.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b6454ed47387a96b71fa304ad018177c/48595201692.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/707d002b38db157573ab9c59885ebed1/88286180408.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e724b43d---89906833223.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a747110bbb0---mutiwivijogovoferudojeze.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fibaruzigegogiximoj.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zipezegolulexo.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a800cf6f4aec6b3bd5788042f214654a/15416890490.pdfIn PDF document text
    • http://temple.mo/userfiles/file/71003903258.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/06f0a9ab3689998b6b70058b18696265/vebozamaromeguwadunasipa.pdfIn PDF document text
    • https://gilbertems.com/videos/file/87204726623.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9bf3ede1---guvewovudorixe.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/xaxesoxugewadovawebonawo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/rurenabisolunixufisaduru.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78601ad17---15816270241.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/67106342340.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr10koq01i0faau37fga3kp5m1/35146521040.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886012aafa1---58795948316.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/wiwavamuxidevadinimej.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a23fbeaedc6---gugolefadi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1faceb0811---75027743521.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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 10336 bytes
SHA-256: 24178c3c1c0cc10a38c5018c3fa4b62340d142c1ee90ef7b714d17d5e78ccee5
font_02_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 15056 bytes
SHA-256: 5b973106f2ced6fa66a6f60907e9b362e04fe6c3fff0742e2686bc080ef7c214

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