Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e583a2c0885978…

MALICIOUS

PDF

108.6 KB Created: 2021-09-05 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1f246ff9b127084e0465ac393a6b0c3 SHA-1: 440f77c1cad09fccff49c5310ee9dba993d4d90d SHA-256: 75e583a2c08859782b4a1c05ef9eedbfec7f652cccac210c9bda85643e007e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised WordPress uploads, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://duz-drustvo.si/uporabnik/file/32004074713.pdf In PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/gogekowamijipakevano.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/26i3l7ugkcqvpbp9f1f4mi46b7/winewijisuliza.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/34229273817.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/66515493623.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/razulixukiduzarerezir.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/28607386876.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f7fcdee2d759572c9bf750fc73c9318/sodisoru.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/49527411718.pdfIn PDF document text
    • https://tekartltd.com/upload/files/lulukuvaxo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c040ef2241632ea3f6fcf6338277a32c/refivuxamajegifomix.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b75a782d68f167e99d65f67e60e39861/71316868670.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/94882403581.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/dutidolajemeb.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/260916096696.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b5ql7rdpf3eqdm2r936ii96rk2/22578695457.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36f8e18eb2---80898636314.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/navagalutedevisaranireju.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9ejadt0b22bktibqkqcl269735/31379766099.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28752589758.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/jojufejibubeno.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941788f106f---57023862022.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3m1ul5i2v7o2e48v2u9t2hkolh/95763647510.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/gnqev2elme6drviri8dv0l1fe7/74706058112.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/79sh7o3qig43kor0djc7vcnh62/ridipalimipob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=drogas+narcoticas+pdfPDF link annotation
    • 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_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10616 bytes
SHA-256: 92d6cf6b0a1e4c38b0ef0965ac0817be255c967f842b67e1ffd451ec1a62560b
font_01_sfnt_off000155e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF7 21036 bytes
SHA-256: bc22d60467f5f95d9a2c55188279ca231caf0f9ad82495bb5c1c32f6add3925c