Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f0e668629f4053…

MALICIOUS

PDF

98.9 KB Created: 2021-07-31 11:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afacd22b333fad35c0967f70579db477 SHA-1: a0ac91a1079bc8b6653676961d863b9cb1fbcd8d SHA-256: b4f0e668629f405333ceff49366553ce28beb082daf0d8edc5cb170fbc0b27b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure and embedded links indicate a phishing attack, likely aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91412287235.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/vaxorevulefowitaxoja.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xixat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a45c3da74---83597143253.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gaviwoxubajalinutito.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/tofimemujuna.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3a9606318ebbea62f450ef7eacbe171f/41992492249.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0951be231---tozusubisaxud.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/64413350277.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd947d7848---dimaza.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/guzutanifaguxiwolijat.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/4883888390.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sikilofafosonegisup.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100c9d58209b---6248919612.pdfIn PDF document text
    • http://charontrade.hu/data/file/fagazudemomumusegarat.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/84763148740.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/a1e673d2c4349d877885b819f435b77b/mugase.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/zepafodarevifuj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160860df8bb7bf---mozotidawovusipedurizeb.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609131fbc64de---81590317685.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/61612105979.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e92e7e31bc0---kulenumupunolitep.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/21856213707.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8deeb0cd6ba03953b910a71b2cec92e9/55432726578.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tdfku5i1vkjvnmldlveihevh1s/pusotijebitajumuzokilab.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7c06b65cbc4eea0ae2aded7c05aec20/66175198178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pago+de+tenencia+estado+de+mexico+fecha+limite+2020PDF 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_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 11168 bytes
SHA-256: d502ce6ea6a75512493b817a44070b63f4641cb6274a79dc9c286a297b4c4170
font_01_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B12 18608 bytes
SHA-256: e5ed2bdf575befd064a430e1b2b1c392c7357444d5ea7fa239a8f5bdfd959259