Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95d605d376b3bc5…

MALICIOUS

PDF

122.3 KB Created: 2021-06-27 22:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 972fe1331e069a07bd2d9dcff724eb9b SHA-1: 9d35cd3eceafe3b2a43f9a33afcb12109a8ff920 SHA-256: c95d605d376b3bc56f738e4d0bfaa16b237c48f3e56cad38a789997ece058dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://cructi.ru/uplcv?utm_term=bony+fishes+and+cartilaginous+fishes
    • http://broadmoor79.com/clients/864886/File/xininamemojisuwukasobofi.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72c73eeac8---20998208497.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c0e84303---29714861746.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wizoxuginewaja.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52841da6d---fowogumagupunowiraxiwul.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qcqc71preofr0ft1a9budpafa4/84464747576.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1bc2fb8126f83e93fb86591c253f7ac5/81265352589.pdf
    • https://mobile-translator.eu/app/webroot/media/files/70490438892.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3128bf02d8---kitapewekosabuz.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/301d25e462633c820959183b5bfba941/bagavisegolofinujuni.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fcs8iv33h0887im444nnstfas5/togurevilezimujuburebatem.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16074381740739---5893348339.pdf
    • http://araonline.hu/uploads/file/66840619224.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a7043721---bevojagodule.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a6e3de2f693a7220c8f9b3d499e4b564/womepafesuli.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607276833ff62---guwiliziretudopepun.pdf
    • http://venusland.vn/app/webroot/img/files/3429402914.pdf
    • http://historia-bfured.hu/userfiles/file/rosevilujimaduwufaniwi.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/lufemenap.pdf
    • http://rhondachem.com/d/files/23891713819.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b0b2d9c0---97509897123.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8965d1665f---fobobabugolenavasororafo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945068e947b---77706704739.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_off00017be3.bin
4ba31d434c24ea7f7f57f51b64465d1fef69a9189faaedf29cff257f1c76979f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE3 11020 bytes
font_01_sfnt_off00019556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19556 16792 bytes
font_02_sfnt_off0001ad68.bin
9f0fc93e9b53ab52c578375e34764e371646057a68f895ad82017e88294c9c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD68 17904 bytes

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