Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5094b5c266f9075…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 18:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a881e50da7cbc9abe77a5f278ef95e8 SHA-1: ddee7b1cc5e48fc5536bb17effd01dfa47484e23 SHA-256: a5094b5c266f9075e91a8d845cef5c258dab7435d87acf6c99603548989caa1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://asmitahrgroup.com/ckfinder/userfiles/files/54939060667.pdf In PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/8834221677.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba00d76dc---75324339880.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/77590841441.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/juluni.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rlb785vusmsa7kesll6top3p07/meborusidemofin.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/35b2bbfb83a8fa21fef3150432c7b8f6/39901899763.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/zizoganubide.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g23kmu90sljomi2qbfnop98ips/54327327828.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/76686959583.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/guzoki.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa76f448ab---lomijofiraginidilavove.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/791842815.pdfIn PDF document text
    • http://thaide.org/userfiles/file/58470497763.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/13892166545.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a83c6400---82456754865.pdfIn PDF document text
    • http://fittbikese.hu/files/file/83551315006.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/sixoj.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/rijoxonijudasixutur.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ad02375e623f43b548fad7eee40c63d/32114255840.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4a4f9e8b52f74f8e21fd56938582882a/20990079311.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad516bab858---wagag.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/letiwid.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/18536303819.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/179919cff0a2d70b6283a7543582f693/nared.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd55e403bb---45242400080.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9cn8rbrfan4lm9tinn193bsgkr/dujurajojeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=area+of+trapezoid+worksheet+6th+grade+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_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16712 bytes
SHA-256: f552573e0e3263fc195ddc80534af7bc8a23b2c03a07df1cf8b996e4a164f73c
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11012 bytes
SHA-256: 1c725484f0879de297b0ad0e889219ca61f4f98b9e67ce3d7282d678d51ee573

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