Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f557a2589d8cf52…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 23:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53628bb3a6509f2d561461272a7b26a8 SHA-1: 9e266d3f26a000b827644cfe7aad99d65a5470c1 SHA-256: 1f557a2589d8cf52bbc1b967327c04009c7ebfa60fa28f0e7dd95bb62ed19789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=prinsip+rotary+evaporator+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608909ff0681a---foteranuni.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8ne23f9q0oqbhtainca594uj3s/53479128066.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abd2f20cf---susaduvaranoveki.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/30e49030026e8c5597e9a354da034e6b/15462822385.pdfIn PDF document text
    • http://519pf.com/userfiles/files/58841785771.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/xubipuwagefe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/jisinezudedakefe.pdfIn PDF document text
    • https://afayl.com/userfiles/file/63116347874.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/791de00217568ee905544b542b9873fc/mujilamuwopinid.pdfIn PDF document text
    • http://stylekd.ru/files/vufamavamulawu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089448f04b18---9630618323.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/68714919021.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o2e9q2bek14g6gp1bfsqs59n8o/tomufofawadevujupamak.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104747a7c026---xusasapobedaworenax.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/kuzavegatimomepaxu.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/12250535212.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/22235439140.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090caec63065---14271231394.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/16526376539.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/27k36rfrha92ijahonq0aqj1cq/zilaxijezigodateli.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/wilovuxizekalaku.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34dc765f9f---30218887066.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zuwevobivuzi.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 10628 bytes
SHA-256: d1b7ecbd5c5f205a675f9b22c9ea49bfe0790f8309bad384dcb22958f4458553
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 18392 bytes
SHA-256: 7973e3fba40490e53cf86ce3b9136794f96bd762e0743d5584d60cb4bd9645db

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