Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afad5bbc4291fe9…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 20:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fd58303b09d79a8d6b0d65ad2f4936c SHA-1: 4d19df1c9494d16374b40c221fbdaccf15590e56 SHA-256: 7afad5bbc4291fe9983c320681cb39a4fac2295f190dc0982d07562b772218f6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable binary data, but the associated URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://careersourceokaloosawalton.com/files/public/figizazutemixis.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f71702eb7---virusab.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ae61391b7f6a9024309b1893e4df2d3e/xujizivu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/7175599288.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/60806485280.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2dddc0fc---77487257209.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/54364446998.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/kasinitaw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379a233032---92037383567.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///59927065905.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160897d41b4589---nixejetojinejowasesojis.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fa0a3f261d49b9faa67d7e90393e5003/44189392935.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210606020310.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/29453305047.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723b908ce23---xomikaxinugidi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kadufinajajat.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a4c9a4ae---74240261604.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/zijogikiwil.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a5003d6e34e4d9b3ab74a91cc846ab60/kopufogedepepu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/80703257835.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/59520486937.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2fe11ca751a218fce4b196776a05a289/46899732939.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1da54a39adfe56dfdf6d4837d433b1cb/luxatimozuzubofodejejidop.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/554305521.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/17111095635.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/99815393781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=derivation+of+equation+of+path+of+projectile+motionPDF 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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 11020 bytes
SHA-256: 15abf2d4ac1e7b17600703a747ca45df36ea3539ed41563d0eeb3f64dcee5168
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 17952 bytes
SHA-256: 9aa4c2bd9598d95eb896b7d55856af0fdc26a6efd580a80d3204daf28c566738
font_02_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1