Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdd98eae0156a4b…

MALICIOUS

PDF

96.2 KB Created: 2021-06-25 12:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1fa7f388d8eef13bd0a64f3df76f9c4 SHA-1: a5de8728fb5617ad8f076bfbbb1ba0b492ae4814 SHA-256: dfdd98eae0156a4b04bac66f3229c1e504f55a767af18c29e8afcfac181e611d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/392620c2ab4f2c0287d290cf295cfdf3/76265867425.pdf
    • http://riversedgefm.com/files/file/39067467643.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5c6f113d3239d19331a88657db32085b/32198999711.pdf
    • http://4seasonstours.in/userfiles/file/12945812228.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070beca07a2d---duwezo.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1b184c5cf11cc3d2a04c6a8df4ae6c73/jofuxopesi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609951aa2fd08---lewisodajefo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91056726---1594021126.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ae11d324---gefavotina.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f3b8c116f5ceba65482def7117b5f3ee/silowopikotivofux.pdf
    • http://willbramephotography.com/kakow.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0lr4uegf1142r115lsd1j0uh9e/bukalekupuranuvok.pdf
    • https://ancoraeducacion.com/images/tuziregizibidesexobiz.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bu26nj00m8a9agrt5go39d94ai/denavudeman.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4702f0f810---4036153473.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609859dbc5fc6---rodelomegulapuwugal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=democracy+is+a
    • http://e1pl2.nazwa.pl/busy/fotki/file/buxutafozub.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_off000116ee.bin
879cc0e641ca4c55a923b47aea3c34b36709fb4d45b7239e1c35358a23bb6bec
pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 17696 bytes
font_01_sfnt_off00014505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 16792 bytes
font_02_sfnt_off00015d1c.bin
f950994634b675b30937fc055ad02f9f16209cb8d2c0d5e4ea5118ae662a476c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1C 10260 bytes