Malicious PDF — malware analysis report

Static analysis result for SHA-256 0691782b4384702d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-09 17:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 948865a221c3d022b1658c6501adec4a SHA-1: 9c12985e987536482e01dbb016f3f3a1d820026f SHA-256: 0691782b4384702d7921d795701fcfa4d44bb07499537d6247b7c35dd3e993dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=how+many+cups+in+32+0unces
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/808nmqdhu42kmdemvi7dtqaaq9/57702217436.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2fa741aa---60564903190.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/982d09ed02e8c6156000268cc0e2fd42/matidej.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7dac00475e99064c714c8243177749cb/1961516544.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e9f9bded---wivorajusi.pdf
    • http://fixafilm.se/userfiles/file/lituz.pdf
    • http://ash-graphy.com/userfiles/file/73883531219.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebafa91ac---jufujabesaninumowiveji.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/opg58oaqd4bbicku91g5d289mn/benoxupewokek.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf047eed195---51303292910.pdf
    • http://karate-talence.com/newsite/userfiles/files/banasubikubese.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/76010741986.pdf
    • https://dondepodemosir.com/userfiles/file/80448953487.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/zokomagizalebawa.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3904b4e78---55927978441.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/66021496649.pdf
    • http://ibtaker.ps/userfiles/file/nejopine.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec981497c9---67850453937.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5099b96b7987ff687bc1aad2aa59eed5/67570151205.pdf
    • http://capesociety.ca/uploads/files/95144262790.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/misajumesiregisofajobife.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba9e59811---wopopowukujibeneg.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609484d752374---nusodobafomu.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc51351a5d---kuxumuwojimulomenuba.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/mcn58e9m3b2u54f78aj3u13v52/61264545157.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
font_01_sfnt_off00010606.bin
a71c200b79740802c61ea5843164a8cf0314ee556f18eebdf2dfd3909b28519d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10996 bytes
font_02_sfnt_off00011fa9.bin
914934e350f6460f23957f4496c798a39995e9e1255b03f5c2cbc05737477e86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 17232 bytes