Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a6a13486f5b8c6…

MALICIOUS

PDF

80.5 KB Created: 2021-08-17 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 279a3ebfbd98d8bb944eb61391bb5b10 SHA-1: 80553096e9afad1fc9427139cfad1377b6fb9f3f SHA-256: b9a6a13486f5b8c6e0a719651a87c1fde9d7f5e247d533bf863a3059671817c5
184 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=kabhi+na+kabhi+movie+mp3+song+download+pagalworld PDF link annotation
    • https://shatalarab-llc.net/userfiles/files/ragabib.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xawubidudeno.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3dkbhvcvseacv01hnkfb9l7usc/rufifafewadisubiladevel.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6318b2df5---piwetutilobedagar.pdfPDF link annotation
    • https://samsungvrvklima.com/upload/ckfinder/files/80245125212.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098622b439cf---madixogefiwejaxelalaxet.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/dokekitijufodewemoto.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/28678558923.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fixaduredosijeduram.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0675fae3fad879dbd01b9ac250e5ea2e/mijinexozukidaxova.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/28457985347.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/24608214944.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/49865817784.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/bozugefomot.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s5b4k3dqvrveejfug2gfgopibl/josejorotidu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215132134456337.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/ruvunesatovepidapekam.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/vubafib.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/82792410189.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tonuk.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/35725213476.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abb459876---36450962934.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/65037560377.pdfIn PDF document text
    • 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16924 bytes
SHA-256: e004911e2072f0c841cf6a122ca73c2331d926343a38e87494f81a304083989f
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 11288 bytes
SHA-256: 9deded9c84ef5e63023e2a4b9b130ec132b6ce89e857d4cd64460e78920621a3
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1