Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dd469f581e4b91…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 11:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: becc017ff6d90b712325c4170f5c4a0a SHA-1: 95e03141d030f84a933ac820ba4f74d1484ddba4 SHA-256: 10dd469f581e4b9167816c75adbb49052439c5b5858d7e29e6a000d19a745dae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://anhbanglaw.com/userfiles/file/xododagiwa.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/db2e709e078e3c0a29e3bbcd4ed347bd/95153505237.pdf
    • http://ranaghatpchsschool.org/userfiles/file/91094273751.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9bc27d5f---rururobovawogude.pdf
    • http://dianacb.cz/userfiles/file/3051403874.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/aobmllitijfdepd0r84sc3080i/nutaderujivufabo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pfpf7i5qlf1t25vsk849ttm7p1/warozefiluloja.pdf
    • http://www.deco-interieure.com/userfiles/file/7128176810.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ndso4la2q1r0kq8g93jt4jsc3/bunexudutesivexezodijer.pdf
    • http://sakuragiramenandsushi.com/uploads/files/80690587352.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa30db3268---xipama.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804b2a38bf9---47982077037.pdf
    • http://detikakdeti.ru/img/file/83912467171.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4634d0a63e44744822ce18d40230845b/72266635364.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea62ee7bdd---vajuxarisulexar.pdf
    • http://alliance-ic.ru/uploads/file/masogolojuw.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806e0f114dd---24442223071.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rnnqe50fpgg9gmf4cnimal0n8o/65065078627.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/96b3765924867df04a14be14aaa35827/7551324189.pdf
    • https://nabijdefossa.nl/upload/files/75777692787.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf58a4a73c---zolilisewugopusola.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i526o83tc8g8nur2vo6nep9a12/nodesevoxazoboxiwujap.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/agle86npthmnq471kksmp787te/88737687313.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lt6rcunc7lcrldinuicts08vfu/riwomupozazixeweberutemu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160715175483ac---26437219910.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ebb452842---23531810239.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ril+share+price+today
    • 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_off0000f341.bin
4b4ba0edb97a735d49beb869967c04fb8afc7957f7e9df8854a051b4355eab47
pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10668 bytes
font_01_sfnt_off00010bd3.bin
202ab930bbff6e16320d840d6077007d241959bfd71e7086c5c8c8494a1ab657
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 18032 bytes
font_02_sfnt_off00013b63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 16792 bytes