Malicious PDF — malware analysis report

Static analysis result for SHA-256 add1691b56c1f57e…

MALICIOUS

PDF

108.3 KB Created: 2021-07-27 03:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83f8453fa359a7e7c551a864d199ffbd SHA-1: 89cad49d84e969a8fb3fc8dde73564a2b3766c36 SHA-256: add1691b56c1f57e5e88c3cac626090fd6dd9385d2a432acf43effbd038ac404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF 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 disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66906998874.pdf In PDF document text
    • http://tms-operation.com/upload/files/46634323758.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c50c380f---74134750848.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7c346282---35048618813.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/19561694142.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/29101509356.pdfIn PDF document text
    • https://advik.net/userfiles/file/89557151794.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vawiniku.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47633693870.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rj8uhosucprjcnmn3pl238m982/vabexaponezabevajagojifu.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/89883803913.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/he0r2t4spumai5o6ochkqihqqt/topapap.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc3503a26---54640918773.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f22c243c7b58b9d9831824efaff245f0/19511770588.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a89cce3cd---vatarutiji.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fbi66vs1nbv5g06of6mjrbcuu8/jipuzexasanideluzaj.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe27779ffa---zemezugeparunefoginiso.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c54487a7973---bolonibajisizinezakorova.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8e43a210fb43a9d6c4433bacdae6f9b3/kuxara.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac244cb96---38970941273.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/77t08sknvgrb91h63su9jr9nk2/jagoziwumapolotajavoni.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba0bf8a893---feganiji.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/7754039565.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29f3460e4---foxozogemopatoporizufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+brand+boots+do+the+marines+wearPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00018c04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18C04 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 10688 bytes
SHA-256: b318b6508af850ba8e5be91ad1118797cc0a6556c4e69fbc998825177f3fe19a
font_01_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 20112 bytes
SHA-256: 8131c4a3873f01eee25730ca5f212bbd3206540c89a03a87f135aa412dcbbe99
font_02_sfnt_off000173f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1