Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca6edec2341616a…

MALICIOUS

PDF

82.0 KB Created: 2021-06-28 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ce02602e53edc5854966a1e5d882eb1 SHA-1: f90a6f2a0b71ce25ed5a0d757f6aff0b383f7b09 SHA-256: 5ca6edec2341616a5ab4a8a0fe7c14049a164c05f9499bfe454ac5b36f30b5d0
164 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. Several heuristics point to the document being a link farm hosted on compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure reinforces the phishing and distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce415af76f9a59e09bfcf6a09fba96b0/39076493000.pdf
    • http://magicdiscoradio.hu/userfiles/file/popepeba.pdf
    • http://currycornersugarland.com/admin/images/file/25424406044.pdf
    • http://planetamama.ru/files/file/kiliwefurupabijoretinu.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/633757cfbb558dd61ff24c15cf3a5084/luweg.pdf
    • http://renovator.cz/files/file/lijetugenutet.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608829a35cda0---91594021016.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6b6122ae---xasawaziwux.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098403917a08---dafidopifurukived.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/wigofijitibudusegafusapi.pdf
    • http://stardentalcare.org/userfiles/file/79936058587.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702659945c---19944131790.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/23898743ab46c65c71b36dad7d699fdf/pijanijumuzogegediget.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3736ac77b---41867923425.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a943a32796---7652070526.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2181d7d3---zaloxafid.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdea0d7b11---boloniravum.pdf
    • https://chp-travel.ir/data/file/sexoduj.pdf
    • http://nhactheducthammy.com/upload/files/fuwapuganizavevolokem.pdf
    • https://oumkua.com/userfiles/file/70201838692.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b094a2d5dba9170924ff9d0b2aa4d09/sogonopuregorurezuwuba.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8l37sv5pdl06p5nql34qtv5p1n/56128936195.pdf
    • https://anmoul.com/userfiles/file/bibeditasuvurogevazimubi.pdf
    • http://shreejians.com/userfiles/file/legisekebukagevegibaxati.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/zajekutazuzufetupoxudoxav.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774e5484dfe---lemeziruwidivopu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=equilibrium+notes+for+jee
    • 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_off0000ddbf.bin
99781d35aa6b041f4a77ae1cd53a1da9edb565c891cb75740e15d1069b9ec385
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 17024 bytes
font_01_sfnt_off000109d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
font_02_sfnt_off000121ed.bin
54b480a5056d2d829f2d82d4b06cf9ed696f7b06820f47ac67ada86a76a2603a
pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10712 bytes