Malicious PDF — malware analysis report

Static analysis result for SHA-256 0192f36bf2e388a8…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 08:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b508eaacba36341b5990c0b06f521002 SHA-1: 62ed0411e074c53926a343266323256129cf5934 SHA-256: 0192f36bf2e388a8ad1095be6970fa42e4c3d217fc0d38fcb6c1be768b712aa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the file's structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=jee+advanced+last+year+question+paper
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e53275fe---dusejepovofatogikatorero.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4904783cb---winusixixi.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/fd6f281cdb84133eaeb64553edbeb636/23592233010.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bbd4ca64d---gujuberidufi.pdf
    • http://portalkucharski.pl/app/webroot/media/files/55323205265.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/115ff81db54533e205ba64a8afc0a1b5/zetokivemolebo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0165aa484---kevixibetejomu.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd9f4f0ee---52374264436.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9753b6bc19---sotudusumexenadunidoporaz.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f5e740b1---lopefofubadudekisotawegos.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6m46h36veomns448m5ok6p71sd/56165037157.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4627887e---25192320170.pdf
    • http://www.ecvbrass.ch/user/web/file/11156837202.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c78c243e81a---nuzixodetimexonoronobi.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/57855307872.pdf
    • http://smit-electronic.hr/upload/datoteke/4197608004.pdf
    • http://cnpair.com/userfiles/file/3694319385.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca5cb5effb3aac9c3094645fda72da91/kamanidonum.pdf
    • http://dianacb.cz/userfiles/file/43681956714.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0896cac410---jolebajamap.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/punuta.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607987f9276ab---nanirumigezokibusivik.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xukomixapalumedeles.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6842f955f5---matarufumakibawejesuwizof.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_off0000f0f6.bin
8430b0f151a4bf0027ed7f2c47017158578485df671cc49c14c29596bf87443c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10924 bytes
font_01_sfnt_off00010a38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16792 bytes
font_02_sfnt_off0001224a.bin
f06547b5f196cc597db8da364671bf7b95ae9f82d394a36a2f1a14b537341f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 17736 bytes

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