Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c9c62040403bb6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 01:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35fa3affd05a0c8c19aa1d2a33bd2fed SHA-1: cb3ab8fbf35a99d3578c940ccc5052f2c1a0e8f1 SHA-256: 74c9c62040403bb615145a2062445dea6f27fa911130b3ecd095b6cc105a6f48
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The presence of numerous unknown URLs further supports this, as they likely serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcbf95f40---tosijebibiposumozulofu.pdf In PDF document text
    • https://xn--49st2et51duvk.com/upload/files/vofasazuxawuzanevolobo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/78614676726.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pezefagofukelixiriwuw.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/dotipemeno.pdfIn PDF document text
    • http://hjhchem.com/upload/files/84363256519.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359eac2a795---76499645853.pdfIn PDF document text
    • http://rooptex.com/uploads/49624722962.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/96685624047.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc70dc736---176028384.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/7071883916.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b833bf8cb2d38abb19816bb67c390f55/22642065409.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/fekagefubegavaxubelixawa.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/jubug.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0c311caa06a1ac710276bbf436acb732/75127923734.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/zafalokiporepiwe.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/64066324860.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/89564980610.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/wisutusufipifaxaxow.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/33741506750.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6201739363.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vexeberomafomumaxelaxi.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/55058427797.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/92045005818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mi+a3+android+11+update+date+in+indiaPDF 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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10488 bytes
SHA-256: e01aa94434ab5d067ac33a5d92544cb48956d171b8a4102824a8ad6bd2ece7d7
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 17916 bytes
SHA-256: 89e8284d695b7fe36e6432ec2b09c001b87ab8b2740b48dc90b1985979e9bd19