Malicious PDF — malware analysis report

Static analysis result for SHA-256 a242f1044e72f2a5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-30 19:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ecd946c20a77082db1fce7623584590 SHA-1: 2c871fcc675b1c8806c7f83cd4bf22b6a5bf573f SHA-256: a242f1044e72f2a55792e83cdf510b309df40c38f24512fb837113a206c62662
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a social engineering lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update. While no scripts were directly extracted, the presence of numerous URLs, some hosted on compromised WordPress sites, suggests a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/o0b59gtldugcrnm3rtf57sn6mu/38123240631.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/solozexox.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/40918803242.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zifajumaxovoradugepe.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bf611d3a9d3f626be2d41b24ce5e1191/42125713090.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/lakesezudaganugin.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30192626025.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/nasolebitekofa.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/97664650692.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150179d896a3---55592038588.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/24143950064.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/97335778386.pdfIn PDF document text
    • http://flirdining.com/uploads/files/43013104840.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofameterimubigavuvifuza.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5301916412b6ed03356eab02a1ed7a55/74806159703.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/ramodobolavofuraja.pdfIn PDF document text
    • http://zerosquareonline.com/file/zinajobezowufurinowulupo.pdfIn PDF document text
    • http://flirdining.com/uploads/files/84873398063.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/90106252358.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/naxarix.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/wusenesudupakikol.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zufofutodozozarejur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=install+adblock+plusPDF 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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 19436 bytes
SHA-256: 973e5a3709a72b246aef6b5361324bbfd93bed84233ec9e28e200c61ae4416c4
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 10464 bytes
SHA-256: c536311f3428e97614e904682a8d7a455f56779092108a163e733489a9f2ae18

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