Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a744f5563d76fc…

MALICIOUS

PDF

70.3 KB Created: 2021-08-28 00:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8441b118b504f1a8843aca3f3e4e3855 SHA-1: 00d9924d1f22bb446488c985806fc6d00fcdb912 SHA-256: 52a744f5563d76fc63e3c78bb3516f4a9b8d2d9866c280329f97bd9e9079d9da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely using an image-based approach to trick users into clicking malicious links. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://svsteinfurth.de/radsportfiles/file/40262641949.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/15844218361.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/98e7a04ea3ae5991788c94336ad8207d/61324239005.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c294a57a7---72995111978.pdfIn PDF document text
    • http://labsshop.com/d/files/64441232110.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/padexemenifofa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b468ef2d---70024631387.pdfIn PDF document text
    • http://skomi.ru/img/files/file/56820712478.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/xixafidaloxajirap.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216452754892.pdfIn PDF document text
    • https://aokman-drive.com/d/files/82566750460.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/gamexakusivepajejufaw.pdfIn PDF document text
    • http://vlajamo.cz/images/file/33698366369.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/67748701159.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6c2c8017---bonebifeguzoparawu.pdfIn PDF document text
    • https://etimes.mn/uploads/files/89433427695.pdfIn PDF document text
    • http://contelex.it/userfiles/files/xidumopugofekekipa.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18989880759.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824c7a7c650---42519466188.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703c25532a3---memozoluzukuw.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/30974749987.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tapunegafiz.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/69918979109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sea+of+thieves+tall+tales+cursed+rogue+journalsPDF 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 14044 bytes
SHA-256: 904fbdea73ea4f4039d45062b72de498d8d12620c91f26bffbd6b9fa596cd3c8
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 11128 bytes
SHA-256: 6086f3749483b9c1c878946e7167082f2ce0cbada321ecb8809f27d6e6157b80