Malicious PDF — malware analysis report

Static analysis result for SHA-256 323275e0ba4a22b7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 22:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 25282e81d3e0be2c8e31c597b8921e8e SHA-1: 0620dba42755a0e288f76daf876c44b7829e1256 SHA-256: 323275e0ba4a22b761d4d0daece71366f24d9da50721e6b8f4f62d0e91487aa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cructi.ru/uplcv?utm_term=pdf+pages+merge+software PDF link annotation
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/wifetebeforoxijobavotiv.pdfIn PDF document text
    • https://angkagenap.com/contents//files/49849093235.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ffa2bf52521cda44bc5dc5c1945ecc01/28543866956.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf741a8ad---wimisewuduxuxamigisam.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d999f8a2e2---gajed.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/98887560252.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/55437683653.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/duwafisusofa.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806e0f114dd---24442223071.pdfIn PDF document text
    • https://nevisnews.com/userfiles/warijezapirorekibolupu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/96082487616.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/33916048879.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/73091283277.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/85063383124.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b79791b9b929bce2f5f1657084261a83/75463513397.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/97261829354.pdfIn PDF document text
    • https://33mobility.net/uploads/files/41237830579.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd43c5b3e---91017520920.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b14e681c08b5bf87b2a9b92f80a89695/zilimator.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/50741672759.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb9a2c8fd4---56028804945.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/871138bopc6m07koobemlbu823/8167632517.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97024102219.pdfIn PDF document text
    • 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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10684 bytes
SHA-256: db782e5dcaaaaa9fb276f1d4b0703c8b6b28b71bf8d70d60d9e1fb7d2153b5b4
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 17288 bytes
SHA-256: eb467d7ce3fa4d8226ad18019f270e457266cae0849c5b17c243c1411231a944
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1