Malicious PDF — malware analysis report

Static analysis result for SHA-256 0108ca14bc53c5c3…

MALICIOUS

PDF

75.3 KB Created: 2021-08-27 23:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aefe040ee6cde0182fc23ea47037cf19 SHA-1: e782089e28ea65ab2952edca689e7edeecef43b8 SHA-256: 0108ca14bc53c5c3112ae6162aafd30eda388e50f40ec31488567ec504e3cbc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://drafthe.ru/uplcv?utm_term=my+phone+will+not+connect+to+wifi PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0dca6ffe---75127691946.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/13370423801.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9d8be3877---374940010.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gumasedokenulatosa.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc42a5e78---30943121774.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/te8fd083isl8783cg77kke4cpb/dopaxef.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0fjbv8fvgobj6f7n0as7g8t3uc/71848769383.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/jokig.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/43937995958.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03b257f7e---watigafu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb6ca9c9a9---34724126085.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc1395ab2---17043939516.pdfIn PDF document text
    • http://dentherapia.hu/files/file/bafutigavuwokura.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/63234501977.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/52697806093.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/8785451992.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u1t2c5kiatjfqiuc3dn7vpbffr/xomokijuruf.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e6a5a8c980232e7341fd9f12810bfbb7/zugaxexeguzapamabosi.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mprqpsfvnljmqog6d9arpl150s/kusavesujafuzubafufe.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/jujiwumizoketilibaru.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/33321408751.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//50020224667.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7b4cf72e---8797918750.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/finipagakuridavopejebob.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/58583523399.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/ginez.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_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 16736 bytes
SHA-256: 6762ef5b9e5b820017a8a20b1a5fda0036f8e745ea75aa9c199a85f2703af7dd
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10340 bytes
SHA-256: e4c5f02ce549716d2596fbcc3720bef745e02505bf7d708f812694b9607c358d

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