Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b78a7e845ab244…

MALICIOUS

PDF

72.0 KB Created: 2021-07-01 18:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91d765b1ebb4cd9db89e1b7fe1f62c38 SHA-1: 0bc5313f671fb4962e4cb0e4d0e8965ab51ebac2 SHA-256: 43b78a7e845ab24418434e6445fd226d8b3e6cecd68b8b88fa2cd70586bf4691
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and numerous external links suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kozhikodedeaf.org/admin/my_files/file/94597232466.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eaa776ff2---52562709479.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/22b90dc52a9752de07a5c46c9eef9dc5/62349233959.pdf
    • http://webursitet.org/Files/file/34625037935.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0276b1732f43f757b93b76a1bd1b8eaa/madolerinuxeg.pdf
    • http://asiadomainstore.com/userfiles/file/36441733209.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/00b2071982b3150d74a9922900c4b3ed/81205360228.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aecd942adaba36b426dd80be70450312/42905234376.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ebe68c4a3077361cefe5e6fef84a9f57/48325383916.pdf
    • http://akwarella.pl/user_uploads/file/kedog.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6340206307---gufezesutisitet.pdf
    • http://maasmartcity.com/userfiles/file/37718508486.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a28b155---83435985997.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b790f719a4---46664747134.pdf
    • https://cafe-malaysia.com/contents/file/bibumadofenoruz.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rc76vcj58m1mk2ncbuo662rbb3/rokajapasopokanebogok.pdf
    • https://perfecthospitals.org/FCKeditor/file/54595075262.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9cda2d020---putegifudirupe.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3okrlpkrnn9kcgccpijj1dmlhj/jizitapiw.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f57357fd---64089586699.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807ab80b7c6---36373888921.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/82789498920.pdf
    • http://barcelonasixtytwo.com/userfiles/file/50556487854.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=moment+of+distributed+load
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b8.bin
68844a6e3ef798259303c2671c05b4db677aa3334443e405f216546f9197608e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 15748 bytes
font_01_sfnt_off0000e1f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 16792 bytes
font_02_sfnt_off0000fa0b.bin
69874938bee34a03d63d6667d6442a9463175e40bb8987f6eb676156be27e4a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10748 bytes