Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e546ab9c0244108…

MALICIOUS

PDF

112.3 KB Created: 2021-09-05 21:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96e40adecb32034192bcb1ea12282c2c SHA-1: 3f651c3a5b787dc31606ee535598b4f268f042d0 SHA-256: 3e546ab9c02441082ec8a21ffaa014de632f7d64782eecad2c6fba749c80772a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • 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://gosselindesign.com/images/from_fckeditor/fichiers/wevulogu.pdf In PDF document text
    • http://pomocnaukowa.net/Upload/file/lozitedisugiwafakemokugez.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a230af1dc7b---naluwuwak.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/kudozivegajosej.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87859372220.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076fafd98d4c---55010853734.pdfIn PDF document text
    • https://hsse.cl/files/97328183668.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/97224643203.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/33638471883.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/gugisoledulowijuni.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb92222f6---68510574913.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab660bc6d---lilokosemutapimelesegobup.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/bulodugazapesuxifuxigo.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/gobupurafubafugenuv.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rpqrmu9tf4toq4uh3iud12mfu9/2693858129.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/73501816712.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/mulapowa.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da278d4feec---gudemagujofolugika.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/14234640900.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/47318315266.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/223c73f405156e8e24840111075995df/depezebemibekimix.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/62233372176.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/9007631324.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/54107100070.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nomitumixugoveki.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210825202607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chinua+achebe+poems+pdfPDF 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_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 18796 bytes
SHA-256: ea182c66a3df63164edb8f57672b638d440aef28fe964b4208785444bade3f0f
font_01_sfnt_off000182b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B9 10912 bytes
SHA-256: 0ef56a0b2b45ef814fe49344c5aaae082d03cd75cf80931c44c1a097ba21a67a
font_02_sfnt_off00019b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1