Malicious PDF — malware analysis report

Static analysis result for SHA-256 56720ba7c74c6e48…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 08:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d868c13a2371714494561f668850ff5 SHA-1: f5fc744dd23316f09ba4e35ec143f28e13e38904 SHA-256: 56720ba7c74c6e4894b0a2a0faa3e4c4b13920a64a2cd44076c01e4b4978f601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=match+the+adjectives+with+their+definitions
    • http://denkobarbell.com/_upload/files/fewiwejaxozetupepesit.pdf
    • http://nowator-zpu.pl/userfiles/file/22743800308.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc1cbd81d---65342024766.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/82789d50d94bb9ef055845d2e031e832/99656373257.pdf
    • https://rybczewice.pl/userfiles/file/25422862051.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b6e2b50d---32206069785.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/49459469766.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f7aa9929---mibevasubigegadolunumogu.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/73c8fe6435564808a13cfc72fd1de443/6523919604.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f15a8c37f---76640462672.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f8c46d96d9928a99f9de0edb76e6721/wobitonesuwanubefap.pdf
    • http://viettelhaiphong.me/data/dulieu/files/kijagazonobe.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ddsgk43ajg01k7escjqd84a281/lujibomused.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d8087a0a---sukarivamoberufetomusines.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/31d4f38e7e29c25d071680d376241269/79593518005.pdf
    • http://biomisszio.hu/tmp/figuvedigarixagonin.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1fl7cg5t1jltbugi81a3t6ucq3/gaxubakojifipiraju.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883f6b68c8c---fanapinusarejababowav.pdf
    • http://firanywiktoria.pl/uploads/editor/file/bekoribawupuvozolakakov.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858481a7040---fixobaxufafigejaji.pdf
    • http://kwartetproforma.com/userfiles/file/lofufebukivunepolije.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c0f4f8b56dd7db7580eccae33886a35e/62957654759.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/goxidotoruregobufupuvuxu.pdf
    • https://nepalimodelagency.com/userfiles/file/sepaz.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_off0000f29a.bin
f957c24c43ce1136e32f0a217b33224c7a49291372939c7126bcad63299aea62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16772 bytes
font_01_sfnt_off00011df5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
font_02_sfnt_off0001360c.bin
0a4db23d627af580697f6d1350f8fb69ac80f0fced3f674331234a20b18f3fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 10804 bytes