Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5ac30ee7575c7f…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 20:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55615274077304d9b8504aebfb0d4966 SHA-1: 0e1539cc03ff4c17dc5126745d0f9e33fe26a50d SHA-256: 3a5ac30ee7575c7feea3f7055e9bd3f6e34593cb2b11c7c7c78183514aeab7be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The presence of external URIs and the 'Urgency / deadline lure' heuristic suggest the document's purpose is to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kih8bi41esndudgjmffjpllek5/74054684212.pdf In PDF document text
    • http://zgic.ru/!upload/files/zojakadaworonene.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/33544948822.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/95172919445.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/19216158384.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/58210196965.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/temoludirokawidapijosada.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/58205893551.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/favoz.pdfIn PDF document text
    • https://bem-sa.com/img/file/17417388501.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ffe25480---tepiramenuropij.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1b171df588b94b75c693e34bc21899da/3987582566.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c16507eaf---xodiwitevafujevitiwul.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/tajemexitu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/83646576373.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e688406b6---notikunaleriteget.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608808e2f26c5---52590395613.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrgo8t36v6pt8dmmj8s7eo6hi3/93298009478.pdfIn PDF document text
    • https://le27.fr/docs/file/89700377458.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/673edff1c43e17dbb23cbd743b58bdfa/394066286.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/49691111127.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872308b3a6b---mefozinuxo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745ed4699---xazibavedujitaronajir.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/40295150247.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c202aaf6ee---babireselataz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf37cf5d176---mobadagimewejas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=getting+the+love+you+want+workbook+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_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 11248 bytes
SHA-256: 7b9195c5b80a42209306082f4031e019e54122556b415891059b5ab55e8fec4c
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 18736 bytes
SHA-256: f166bce4186bfab3250fdf01577323511ba83721c03267f4f53bbbb1a2372922