Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d55928e925f112…

MALICIOUS

PDF

118.1 KB Created: 2021-07-04 13:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d8c4227eddd5157242715afd46952bc SHA-1: 66ed357a8edd30a6242ff3b275b971c88664b430 SHA-256: 24d55928e925f112bb8b710de69b5410cc0dd6f627c79a7331dcf050148f79fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a link farm used for distributing malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://mfcwestenkwartier.nl/beta/userfiles/file/6783008908.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b9704c19---ginefexu.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fbb7762bfa0bc9989cad70c7d0c3ec00/guwerupewek.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d183e54c0---92933644865.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8f23602d0d601d1f012582060e6fcd47/34868875019.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210608165814.pdf
    • http://peaktoppet.com/ck_imgs/files/84712526426.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/vureselunovo.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ead6de1e201df571277518a3392ab58d/33770625764.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077befac5e48---57754454609.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kjf8pe3m55pfov00akee743ltb/8412916004.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089857d2ba7a---61970146709.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608909bcca802---kebopepifa.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaaaf8877b---dewesijawopog.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0a519cbbb0---duzub.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087183d01463---78599670224.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4d9089e9---77691870770.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/vajow.pdf
    • https://amrapalispot.com/userfiles/file/96520209087.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b78c6278---83768967522.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83f5cecc8---3551053161.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/02569bf598b2303308582bce3243de77/10905265191.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e01b33336---75529397543.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d46285de92f---54485746105.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/da5qkmnt5o7l164kkgg8kvkf6ol2mm4l/nugozosidogawuxesuro.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/lamaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sensex+and+nifty+meaning
    • 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_off00016a69.bin
5b253b5805032560d6efeddb19069db5b550d1bfa185d7beed9004c5de4ef713
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A69 10720 bytes
font_01_sfnt_off000182df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x182DF 16792 bytes
font_02_sfnt_off00019af1.bin
b41293c99b50fe4ad7eaaf0c87495188b75d19e108e056c5894c93e4d3e715ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF1 18320 bytes