Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b1f80e44fa3fb1…

MALICIOUS

PDF

104.1 KB Created: 2021-08-13 22:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 65cbfedc6383171af0281f4a3bba115c SHA-1: 1d5692242b2c18a27a60b88dc06af5dca4d1ef48 SHA-256: e2b1f80e44fa3fb1dab4811ebf397e7c39ccabcc584e0bf9beec9b34416848e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/49c920bce0435eb181f2bc50fcd10175/rexumozikusonobel.pdf In PDF document text
    • http://kezmosas.hu/files/file/dalikokaseboxitibuwuka.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a59b9b413ba48ef3be693a98568255b/91433520537.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66a1cc682---loxafededebe.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/93aa3afc8baa46120be997f3bb633c4c/29917293791.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/92036962306.pdfIn PDF document text
    • https://panama4d.com/contents//files/kuzukunaw.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9bbadaa97fbcbcfa4daeb5ef33cca1a2/suruw.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/sobiperiwizil.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bnf38a9c895rk4cki6h5nj4qo9/nulivadota.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/468286631e38102536bfeda94029dda5/23964931895.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/61326086849.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078145b5078f---vifezelavopetorotekina.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/66358122823.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a63fbbd8d1e41b94d69ea84e363bb111/nozudopukojip.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/27778553678.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/00c1cd44cd1fb42b7bf2f5d8779433da/linorarodigizafopoj.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/45856727629.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a1ohesj7l9l36usccmrfij6rc4/63090853326.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/12005758228.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cd570e63392d2d8d0ec6c4806f5d1144/61632901443.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/kejefufegemoxeme.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/37979181881.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b239db0a971---navik.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/73832697805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+does+it+cost+to+open+a+nandos+franchise+ukPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA4 11108 bytes
SHA-256: a3e622c1793a8fa982e4c9be4fc571d39b7411af47ecd75a5a69b9b6e2398611
font_02_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 1812 bytes
SHA-256: 901e33f8f21363c41769db065d333943144ba4cd04b873de21be888a8e2f4693
font_03_sfnt_off00015efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFB 18604 bytes
SHA-256: bd23118445961f4d4f2ee441dfb220b8bff087042b156e3b31830b1b9603f9ba