Malicious PDF — malware analysis report

Static analysis result for SHA-256 44619f57fda5af46…

MALICIOUS

PDF

81.6 KB Created: 2021-07-31 14:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3752410fa745ea3390d4af17a8e83efa SHA-1: 38749f64afab8ff601d87bb0a01a76f09514b087 SHA-256: 44619f57fda5af46fcb8360bfadef4c4cd4a1742c36db02d101f1c3989a0249e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to host or redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true origin of the malicious content. The presence of numerous unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://waterlootour.com/FileData/ckfinder/files/20210705_3AA04DFE7E9C1834.pdf In PDF document text
    • http://simonide.org/userfiles/file/15940909100.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/bepilopiximitimabiw.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jelob.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceee076ac39---36660327668.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0835ed7e6---sesutexa.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdca11613---70292174208.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/xoguxati.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/wewedilapedubuzixi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/09497e1dd5781e4b92e51da63375bfa9/vuzurituzidamolaxigeg.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/80026105643.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/womejawujelet.pdfIn PDF document text
    • https://energooptima.hu/upload/File/73073744065.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/91229132904.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609881c991066---9022392381.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bib3ctj67amk5u2khi89g1amv0/80983649193.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1244f3703e4805c0cc51f82b5a7b10d1/22032545679.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/krhkvfib4trg4g7nb471p4vl3l/10540834683.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23102ae710ba8fbaf989b450021ed696/29725173242.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d3160c245f7---47693875789.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/pibojukelobobifozudazuna.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/45450023539.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokan.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/1480120073.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdkn3bm9thdb5f582u3cnc94pp/78552148284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stickman+warriors+super+dragon+shadow+fight+mod+apk+ultima+versionPDF 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 11484 bytes
SHA-256: 9be0cf52159f964906d171bd4d0b678104682d967721e2e4e40bbd97d0bff176
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16632 bytes
SHA-256: abccdc9d4e721bd06e7be0437a8b3187856befd68bb0bb2611c5eea9f1c3e496

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