Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b0a10fa7e449c…

MALICIOUS

PDF

107.9 KB Created: 2021-07-06 02:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c86743b8392a255ceb66632356f3687 SHA-1: fc67c4af2c461d29c6cddbcbb834aeb27bc89b24 SHA-256: 1a8b0a10fa7e449c52ab9a13df12d1882d39303493d1cfdb650c26f1bdd4515c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to compromised websites and other PDF files, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the heuristic findings of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, along with the numerous URLs, point to a coordinated effort to leverage these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=scp+682+godzilla+king+of+the+monsters PDF link annotation
    • https://seikico.net/img-tym/files/moxulixopevaba.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2649d0976df521f794f02dc6138cf65d/24937864240.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da196594d1---xefonuri.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/pawowusexetaxudikeboda.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tikodabu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n0v490oatsabcd48mhtanebdvu/93609436923.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm315kqjqv2l4fer4o28jhem43/xoluzudagapiwokagofogolu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cae256a2ab---mulalubipibukigalamu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df3b924d527---suxomilifosizupugitofo.pdfIn PDF document text
    • https://maturana.cl/upload/file/vivupamoxilivuwajet.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608223753ad83---mizugu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee371ac4bd---vegerawupadoxirajowezez.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wazatawubofisegubateva.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/24183801973.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9990ea2e---68092451211.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2fk3h5d987l4ior5kus96dcl6e/memazede.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a037650d0f9---42387900808.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0bjifr01jumm20imp6hjn4mf54/sesafu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70d1ad3a4---88375211603.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/s21jm6bkmrojqkr54sonv3b6l3/31716898371.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/74953318734.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609016ef35960---49341829734.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a0320605---35519955629.pdfIn 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://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_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 11792 bytes
SHA-256: 80a9c9cebdc5c0c8422c1bbe030a8b618bce77baaf3bb98763ce0f16f9be7f8d
font_01_sfnt_off00015f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F17 16788 bytes
SHA-256: fd48efeb744e98f2809f4ce8734085f449ed1da374f29dd682f3a1751e43d93f
font_02_sfnt_off00018a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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