Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babc92cc0079783…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 17:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a70971af9a347af0433765c6dc1ddc8 SHA-1: 3cc1cc6cc99bc5c42e51897be7e36547b0b36eeb SHA-256: 8babc92cc0079783c144dfd5a0612911df8f3d790026040923d43c89adaf7767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards exploitation for client execution, likely involving JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=anti+tb+drugs+side+effects+pdf PDF link annotation
    • https://siam-royal-view.ru/data/files/sezuwalosojamubonabekiba.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/67152872742.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/kolonirokotuvu.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lofuvutonikokobimip.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r960nbm2vivet11uvg779p51t1/mupax.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1234201029.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607319e9b4ca0---43030545844.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/20063142229.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/poledikudugapabogo.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/pejebipit.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///6427498721.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/32065089993.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3aa01f3b---6472798040.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/76114343106.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4d06e0ac61a8de64d0eeeb044ef6a34/49887842715.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcb15fee7---nojokabosim.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fc2e3ff1a---32532745408.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/66995266171.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/dogaviwoz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/14002410866.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/rigawimatibugixuwaxuso.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8914a1de8---mirugonotuz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/eij7dbb48hklemi07o70fi61ut/nikarosev.pdfIn PDF document text
    • http://feg.vn/uploads/files/84914914091.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10688 bytes
SHA-256: 86877f2c9e2c3ea99a6e4fefdaa7d6b6205fc9e4e9dacd5f3015d7150872fb02
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17832 bytes
SHA-256: 9e7fb896effa92401e5d241c5b69aa639a124b3d0811b562b128b7ccddffee83
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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