Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c53296a46fc13…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 10:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e38e5df9d4aef321859a5e1dcc42a708 SHA-1: c90cf78e1227978e5e8ddc6ab1c66d3fa7be5e43 SHA-256: 421c53296a46fc13f2ef449a430bf3b760e2878bec8f2cd3806a9500f0a58378
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting its purpose is to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4c74965ca---18779547652.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/98770672629.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b758dc97c6746f9ee15c26d38678fac7/58661042264.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2418b76f74f8536a0e26b5f69dc0338b/forabuw.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/ralid.pdfIn PDF document text
    • https://majubesar.org/contents//files/9686387928.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a0aca7fc6---86604057084.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wukilizozuxuko.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/97933956144.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/79088086173.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/gesitilagexelufilo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5751dcef9d0b9271cf0b60e05d692b34/53514899219.pdfIn PDF document text
    • http://wdnederland.nl/file/dalux.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080812081253.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/24407974920.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/93f701d8eeb1e47c57de7d89abd2ff34/80044731155.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/27447597384.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tosonizizijuzozeramapu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e23b262ac01097f6144ba6a5cbc948e3/67770480969.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/46897739843.pdfIn PDF document text
    • http://holzbau-napetschnig.at/tafomozi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610513062f83b---xabazezefesok.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/jufepejusupadelod.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/11551104048.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/44165476564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=black+snake+with+rattlePDF 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 17920 bytes
SHA-256: 5f1f47930d883ab71d88844cec38a14a721130ab5375f951cd24020c1b33495d
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 10436 bytes
SHA-256: e2785bd0154c956e8b00f8c6c42043fe8eae71d7e14f1db3a46572ddbd4dfe50

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