Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3877fc8e48c86c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 12:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: debffa74d1cd55ad3f3e6c7c62dd6105 SHA-1: 2d614af1d1cbcc7a832ae2a8482d3bd91196d08a SHA-256: 7f3877fc8e48c86c3e5e07d3b3b46db415392d4f59385a18d2f89b8efa78452d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to conceal clickable links. The document embeds numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the presence of external links and the overall structure strongly indicate a phishing or download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 2 text block(s), carries a click-outward action, and is only 68 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 https://smidgel.ru/uplcv?utm_term=watch+roohi+full+movie
    • http://francescofesta.it/userfiles/files/82619431237.pdf
    • https://mfdesign.hu/files/file/xisupisipoxofedosejuderi.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140d53f34c6c---69873306938.pdf
    • http://pfmconsulting.org/survey/userfiles/files/11025303185.pdf
    • http://sarljarry.fr/userfiles/file/xaronanu.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/5852531472.pdf
    • https://gymlesgeants.com/upload/editor/file/tevewasumanisovix.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21462675543.pdf
    • https://matfplayer.com/calisma2/files/uploads/vogovesanax.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/jemujatofawuvisawe.pdf
    • http://dtjxbpzx.com/filespath/files/20210923072231.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f3bbe06---10344118588.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/vewolirabonar.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed7d61c09c---mapejezifobag.pdf
    • https://detectiveoffice.net/userfiles/file/9884517356.pdf
    • https://privatecambodiatour.com/userfiles/file/falawuruforos.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/46302089738.pdf
    • http://brenna-ski.pl/userfiles/file/55656042336.pdf
    • http://pappteam.hu/userfiles/file/57575923976.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/kijebupenabaluwi.pdf
    • https://tivicom.vn/upload/files/85924519751.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afaa.bin
05ac0a510fc54cd6fcded78f02da8f527da14431e91c0e7363388849fa52419e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 14496 bytes
font_01_sfnt_off0000d3d8.bin
f3be84b858b716dc9071b1a07147a8c5f124acfc2b1e10136af9908874fc77ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 10488 bytes
font_02_sfnt_off0000ebc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes