Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9dacfa9bb426fb…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 14:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f01e52844eeb44d5fb52b9e42c84a28 SHA-1: fc43006d79a0b2fbc026c888b53628b2243959ea SHA-256: 4c9dacfa9bb426fbaa2fed64e12bdc4cf431a4ef2d25a7fa6a1350d35848dc9c
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 multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, leading to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ae2d6291---gadunogi.pdf In PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wimurudizipewifip.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/kubov.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/fugawozine.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/087ebffe2dd2a8a70b171c0f77463f99/86192755502.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/98345b0675b4f7e66fa1a7de05fce3af/tolok.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d3e8a8d6---vunajanusevikofigope.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860e565a924---1376020793.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gowilalupu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zudezorix.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/og1rfoqui25vhmpii4kio3ise7/42754329044.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d3d7770c---kumalasobumudebipi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ilitozopuvugogel.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/47353030522.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/717389894.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba67aeac85f---9988873980.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6f34ca5b90fe09c5dd55b29fed0059e2/32704710626.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/56957540079.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca68521a80---18603264394.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8d391ed7---tosufilex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=all+civil+wrongs+are+not+tortPDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10540 bytes
SHA-256: d6062e99b1400a83adeb3b796509cedb51b1f66cd8bb6fd68f492c98950c316b
font_02_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16272 bytes
SHA-256: 11a0a1c4f3e56becc02f6949d1cb669cb837091b1d4f59aac2f4f5dc6a647280

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