Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a66a32d12b27c…

MALICIOUS

PDF

118.2 KB Created: 2021-07-07 07:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06e94b426e0e51433ecb38da65182fd5 SHA-1: 1139f57a73197d0edd40708ed74daa82570d0252 SHA-256: 315a66a32d12b27c082dd9c91030c89cb171ef0ae8556faa083d4cee945ca855
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous external URLs, many of which host other PDF files, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fp0hh470ssbs1q3bs9e05gfk0t/javuvi.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fb256b7696bf9458723e5f1264875206/sajulewotifitaxub.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9b7797e28f920b9fcd353b03dbca9106/22090517277.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160702329e9081---33525892840.pdf
    • http://firegallery.ru/img/upload/20118574860.pdf
    • http://2440027.ru/upload/file/71001018579.pdf
    • https://ladangmimpi.com/contents//files/53807634304.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5ol5jo7u40sc5ogf7eoplh7a5o/tudevadogufagozen.pdf
    • https://olterus.net/contents//files/80306569042.pdf
    • http://alimentosldm.com/userfiles/file/76486097146.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160804f00957b4---bapolisobizugepumusupef.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/44e6f2badebf2de49e2bd79cdf7675ae/xujotodaxutelugan.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/79p5o2cc7skernch53urdbsh14/73030286947.pdf
    • http://northcity.rs/slike/files/82119680755.pdf
    • http://ajarnveerapong.com/UserFiles/file/xubol.pdf
    • http://hnc2.com/userfiles/file/wozuvatupusojojeremofeno.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96ad51fdf---13270580005.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/325f0929e263c386a93e2a466f24ff47/potowevowavitosubufewez.pdf
    • http://ty-universe.com/image/files/20210707_022400.pdf
    • http://a-kamen.com/userfiles/file/18265784330.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/obl4pjlb5vg11dsrm9b3d8thvg/53655101728.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c7e466c100d4c2c17c10a3f4c467f9fb/59723349320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=user+story+structure+agile
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f951655a57---gipifewuratekunagil.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_off00015e47.bin
5c55c051f46c53fdcb2a82a90acc7b79319e07610b6335478d26215254115ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E47 10520 bytes
font_01_sfnt_off0001766a.bin
b1ce33939ecf8acb1a6054146868a2dbca604bef0c00eeb0b0031e726e3d1d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1766A 29428 bytes
font_02_sfnt_off0001b1dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1DD 16792 bytes