Malicious PDF — malware analysis report

Static analysis result for SHA-256 51673b82985cc96a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 10:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a2a264a5b7f38683e2c5a095eca21ac9 SHA-1: 6ff43d667e4bca594fe301fea518675db9fa8a12 SHA-256: 51673b82985cc96a598b827c93377d474331d3ade1f8c6c06af71d62514fa3b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://espokebar.com/uploads/files/78870489927.pdf In PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/8674904247.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/81722398053.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/mezed.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gifudetawod.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/76883287946.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/62616480856.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/pumuzuvapimuwilatomu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137df7e04682---11610043205.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/nuvowizugosilos.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/muregogejo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/97377858309.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/zanupuragadudadebekogeno.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908060256226108.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/91812043963.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904115423_810u2c.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/xixiladoreg.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/temewufozovurarowewo.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/77433633087.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdffe5a36b---99818423707.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/lukuwoko.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377fe635b00---debenikap.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/kosol.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq89dspfjfb5shr3j9mupgbfe3/26012434944.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/5441371377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=como+pasar+contactos+desde+iphone+a+androidPDF 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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 19524 bytes
SHA-256: c9f1c13ba5f657406caa8dfcce9dc50dc5925b9f459a6e876251be22ff450b63
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10764 bytes
SHA-256: f8b3393c31eda73129a4e8473fe95db45c9d2be2f52148f32204762a1b76abf2

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