Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e5e7fc22678a7…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 07:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d432b34d003e9b283ed0f26d401f12e SHA-1: 3c85447d0d194912953e338d3cbc3c33414af17b SHA-256: f66e5e7fc22678a736c7d2c30718ad4fa0eae771775a6aebae6668de03aa264e
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host other PDFs, suggesting a multi-stage attack designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f407c4ad---mivesejowow.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/380128cfe7fd51c2fab7213adf8cb278/96732576963.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0a813754---jadusuje.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6292707e---11858796646.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64d9db5a1---dirisoragonudidame.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a35cc8502fe---nefovevowotekezuval.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f675e3b---linezeziwuwimomagowu.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dac6180bd---fezerarozunujevizomazad.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///zagitawepe.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4ch3jpu6bpbln1ck3s750uu73/34440043731.pdf
    • http://canphantich.net/Images_upload/files/bijunuxulaxagimuwesa.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d7feafa5---tinilutiripodi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/i6fotkg6qrqp036seeqv5knn50/87577640606.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f06a525d39e068631941cf07ee7747a0/2634741107.pdf
    • https://soechi.id/userfiles/file/88807858355.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/uth19liu3e44fb1bv3u2j17rqn/12494183411.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ba74e4f---65260617916.pdf
    • http://faw-asia.com/image/upload/files/1117326309.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ddd15ba3---xiguboloxewuvagubiraguf.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/51719974617.pdf
    • https://people11people.gr/uploads/File/gupefurusuze.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6ebc2ddca9f4922872221f5d08d8ce3b/15176793887.pdf
    • http://goddesshair.net/upload/users/files/zokizaluvibidifekedi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2948c5643---58273238192.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884be6aef93---kofoluze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=state+syllabus+8th+class+science+textbook
    • 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_off0000e54d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 16792 bytes
font_01_sfnt_off0000fd64.bin
8391cbf5dfbafc73a9fb9aeaff189268a4386a5669262fbd821f2e18a94bd8d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 11056 bytes
font_02_sfnt_off0001171f.bin
3166606ee6d8de85bb10dbda69e01c13734b5a4debffa10f35846d0b4602c4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 16744 bytes

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