Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc9f9351027acf5…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 13:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 94b3b5314739d02d97a6e3603966f69d SHA-1: 3cde094cb72ef1bf5ac37a0301183245187dda36 SHA-256: 5fc9f9351027acf535249cda19cc58d34af19eebc19e1804f91bc3815ae5334c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links pointing to potentially compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated and appears to be a screenshot, further supporting the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 0 text block(s), carries a click-outward action, and is only 69 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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135feb89b742---92168935569.pdf In PDF document text
    • https://mimpiindah2.com/contents/files/tijatuduta.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/18623016738.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/56960722808.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac3ed290---14099442230.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/nonesokijubetaketufivirok.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/12775816310.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/24390813381.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d8e6c6ee7f0783290bbb0ea6b21b5c38/19210727524.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/wovaxasulupison.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/69029733460.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/weterozijepoken.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/49136251851.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7a721d10fc05b406a2cf5307c1594fd8/26487877439.pdfIn PDF document text
    • http://expresskaliski.info/file/274204189.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lismi7ake5p0s6rqq9pcconm82/4274319135.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ae001d6---bokidudaxitowekekezas.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/30740140755.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a9293537---53094860172.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/61800326147.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/97992807322.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/pizagaduxalus.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109290319189977.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f1c107ff---zoniviguvetimuziwojori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thanksgiving+proclamation+2020PDF 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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 11052 bytes
SHA-256: c02ec122d9c25df478365037a408ee1c9377deac65df5d5a74ee5ebff1410d84
font_02_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 14116 bytes
SHA-256: 823b0f27968cdafeaff81bd891155e6e016318617ffc01ad4325897dac95378c