Malicious PDF — malware analysis report

Static analysis result for SHA-256 d722179124c0fd11…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 21:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c075bfe2a4aaec44542a6256793fd8e SHA-1: 8e256459efb86f8d5a7261fe3020763c05f1d632 SHA-256: d722179124c0fd11bab5b3b83497197e0efd1c3a556da1e40d79e2e6e2efbdcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prosquash.by/data/tavek.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce88358b---wivemunilu.pdfIn PDF document text
    • http://nature-revive.org/files/file/norotovob.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c541a262b55cec649d994f5761c3c644/56738587708.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/50dba0ff81ed5dd036d1f76796bf5752/21599701643.pdfIn PDF document text
    • http://adveotec.com/img/file/31891580253.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4c941e820f8114789774226b9f4b86db/kurivurid.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e9fb6eea---kofuwetobibepuxeb.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/samejo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbf9c396c---16971692265.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tijimoleneruw.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7caa6d6b---61885033299.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/931307ca76cee2b99f8a71db9c007af9/devakadorisasize.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///91582105031.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55dfaf7d8---31422151981.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ce433fb9b541e27478e7d79ab24e6e77/77890908894.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/43156217590.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22724036256.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec349e99b7---vasesivekogidugaverik.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/95617857136.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/vadusibewuvisezemam.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/27536889250.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075467e46737---99384207605.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982e63185c5---30815721816.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kawovubofadupezududi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61815950545.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xorigukatetagefixuxaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bring+out+the+holy+hand+grenadePDF 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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 10628 bytes
SHA-256: bd4f1312f88559b94122e01b6ccf024be5cef81402887796a3fc53d8d1ce95fd
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 20692 bytes
SHA-256: d208887627d4b8db938883f5a7c40257453e53d61d7511c0933d47577ebb9cb1