Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cfdb12a884583b…

MALICIOUS

PDF

103.5 KB Created: 2021-07-20 05:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45e8998d2b9a0490ce566bb0ada0b8d4 SHA-1: a1fa959e0e94318c4c417d07bd948eeeb05962c1 SHA-256: 22cfdb12a884583b2491f53c3295d26cbfedd080b876178c597483a766c14d95
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm or phishing lure. The PDF's structure and the presence of external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0f24fa6819b65e5935dad76a8a4dab7b/12942411750.pdf In PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/2pf7cuv5evlg09absd6e6v5iv2/sizox.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75566adeb---nuzezudawiminexu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1be558b3f---revurizetajemifamiteban.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/nipifelovajalumelokat.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sizomosonusagawala.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/laginasogobapitegaraz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82364aefc5---rokawizaginitixelemala.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/24361334196.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4pbvq1u74kls8scnh85u7pjdct/81664901607.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa725742c42---sedador.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777a8b63fe---67269893664.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1989dc82---xavakagukowitiwidif.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gitomupemidasazufujuxigol.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210713235621_1315525659.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/hh7bp4ov42ouofop9v7gvja80h/vosogovijitin.pdfIn PDF document text
    • http://zuche0551.com/upload/file/87136768994.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/21055584771.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/12146013d9dc5d732b17a29e4194cd4d/kaginodoxaboso.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7714f833c392c915110892b291dc8e78/36316184790.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/laponawusidar.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/43fc20de6623d954dc0199169130df4a/xupotuseditoledaneg.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4232d97f8---porapal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=system+of+inequalities+calculator+graphPDF link annotation
    • 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_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 11360 bytes
SHA-256: c9241741b9ba3d2446f46d6c22d638f8316dc654458a2e90ca8712064ec42a34
font_01_sfnt_off00014c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16422 17040 bytes
SHA-256: d6232da95972abdc0d6008af281b5fdd0c247b955bb9ed1c1172ea65d4327551

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