Malicious PDF — malware analysis report

Static analysis result for SHA-256 6813d606febeef1c…

MALICIOUS

PDF

71.0 KB Created: 2021-06-10 04:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f5db568dccab63671bd98ec8684eacd9 SHA-1: c5db9d64ff4c38f0ea6c57655648e79d81bec6e6 SHA-256: 6813d606febeef1c716ba25e754fd671a43f7778e8efdcfd9f2b935f033f0289
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm or distribution network. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=bandobast+telugu+full+movie+watch+online PDF link annotation
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/db846641bad6e5d2a496b4d4209a610b/nofepisavejelawa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abcaba3bc7c---torimufevanodimalav.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097008ed0caa---faxokurowozetovilikafapi.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/55205072160.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531134614.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/7078816627.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946fcf8cfd1---rozopos.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/805a2000fc2818fb995b35cd1fd558a5/paliwegilu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/25058905490.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/70lm2as2q6vuubct2rivqjne84/dukigumutigiwiradu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/biveduzakore.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gusifmqimla0n4jibo4dn7p2l6/28266288000.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/978e247332382a9151c72c2f17a912c0/pilugatulojatezojepikem.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/58721487033.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8a7df08a6b3343585a9436734bb81a66/poxetapog.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2709ff27c98fe6f6ddf4725826e2c724/51643652199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 5560 bytes
SHA-256: 5f2c6814647f42f2a75778bcd6b611beab4844d2944489c7acc4b9b3b0d1c512
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 10392 bytes
SHA-256: 5e3db769aa936e64f86707d1323e4d339ebc69804af578596a3eaa59f30a4370
font_02_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c