Malicious PDF — malware analysis report

Static analysis result for SHA-256 6209df06cfaf2c14…

MALICIOUS

PDF

184.0 KB Created: 2021-06-12 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a6b80b442786ecf8d70c619a93b1a424 SHA-1: d257821c2dee03315ff3124b86961b42f606b561 SHA-256: 6209df06cfaf2c14106811c16aa6c4a303f6d468771bb3ce7a2f2c950cb8df0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, further supporting a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=java+for+minecraft+latest+version PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4357cb8df---guxije.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3650ffde832161d5dba061545cec5c31/gukat.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1d022f336a241bfb4b56e06a95960fc5/davojawomubo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/02657df39d9e3acdc19b3891958851ec/nagoropojekerorovuraw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c683d0281d---jejuxomabaleta.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2929ad4e---xejavafagifoxatogilitodas.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adadab01e62---92194098008.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160760cf371b6d---daxabezibebuvinefipabe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nrfalg8p5ajgfuqh42640m53sv/95487232853.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5bce8a98---16502287746.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6fb54eb73f0edb20f5328dbb1d5b998c/pisosasuxexinigivi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/najolefaxudagel.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/suluvipunulefo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/32188788926.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/piliguwigoruwabunu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/baxelobufapejupegofo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f90296e0---57642097269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BDC 15172 bytes
SHA-256: 8721663621d2a6e9844bd4661b9064a2b55bbe548de8e8fc6dc30dac2c1d9942
font_01_sfnt_off00027dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DBA 5076 bytes
SHA-256: f19380502619b551b1f2214eebcd744331259e43e7d977d32d530b7c7609db3e
font_02_sfnt_off00028ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28EF9 13968 bytes
SHA-256: a183dabeecbf4428693a1b78e60a207fdd2c7b887ec8f56ae3af486f7017ac4b
font_03_sfnt_off0002bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCAA 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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