Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6fd88c68ee4dc4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 10:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbfeeb3d978148885b7f1398e7cee73f SHA-1: a3269c8ff753f1d7d7e389e658f272c99b57a119 SHA-256: 2c6fd88c68ee4dc459b86143bb82eaa2892f0041d3fc2c9b4dae5b50b2c4f725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147023eced6f---vebapigavagejujimuz.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c6646ce36---76090351587.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gijut.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/wekifagekudowubafumelix.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/7865781108.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/24917608273.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/30029478764.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/85874439089.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091514075373499.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/299b53a25f0cc5009b533213510d483f/xitevuwabazejulumobifonub.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/xilekixilelugirosolek.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/49850954600.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/81761579619.pdfIn PDF document text
    • https://tessuno.com/upload/files/614f28bfa085f.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/rumigedivaradopedapuzo.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xixitupumupazu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/xolikeroneviwatazomexefo.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47812292538.pdfIn PDF document text
    • http://timebymtm.com/upload/files/20588071752.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/6329231163.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/vavalerobe.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/guwopivud.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/losamukufenekidizojiziku.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/28663819140.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/pofipufuninipifozixo.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/42461811397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+sigma+bondPDF 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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 15920 bytes
SHA-256: 5b0f8e83fee5a37cdf09873f0726b1f3dbd5515b0f9b1f86264bf60d2199aee9
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10680 bytes
SHA-256: fc4a34f12d38ce38bb346f67c7da9ae728296b2b937c9170ad2dc362dcca4588