Malicious PDF — malware analysis report

Static analysis result for SHA-256 288e2ddb0b175cf6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 06:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bbe2cfa4082de9b8c0fd4195eff6f72 SHA-1: 64d8a60ab64ba110fc75d573142bc51b909eeede SHA-256: 288e2ddb0b175cf6c8819ccca60cfdcdbeea7835cb66f5c0000ee9fb9d662ceb
156 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 ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a social engineering attack, likely spearphishing, to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://jutaek.humenia.com/upload/userfiles/2021/09/files/210912151719.pdf In PDF document text
    • http://mprime.net/ckfinder/userfiles/files/sigexakigewejudi.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/86833442475.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/64603686822.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16147524ebbf86---77415303443.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147eceec6de9---wevagokekodi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/64959900854.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sojekepisavafez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c01fe3bd3---wazavazurex.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/68722723699.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/69406312803.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/pomemuwozoj.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mogavugajosin.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/14638342716.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/1975943682.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/fenoparu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/difewegukupitopuje.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/13738579126.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xuwanodiwavud.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/33sguj5451u6i6j2b68djpp0m5/99717533330.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/21264754595.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/nulije.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/13018254079.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=triller+apk+downloadPDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 18268 bytes
SHA-256: a7ba78bfc914c6ed6f1d1b537a11255fb6a74b91376df699eb754e072058667e
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 10260 bytes
SHA-256: d328be8c8f3f90d29eefe847d2539ffc851f841e8bf461a726b186a293b20cf0

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