Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a63990622ff52a8…

MALICIOUS

PDF

118.0 KB Created: 2021-06-28 00:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0489f7709f95ec88ca5304e2772b2249 SHA-1: 0476fb6ec9cd8f94fac4d5ea9b192536a7205476 SHA-256: 1a63990622ff52a8c31f4c6e642c78cbfaa8a55d9209d6d05395abf6b3f29d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://smidgel.ru/uplcv?utm_term=meaning+of+nale PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/brtu2qv198gcag3hrcemrj5es2/fiwinopuvuvifabamobinip.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0cbbf208---pakopevikazagolomomonif.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mbburpkvse4uadgbtfojblnhs6/masutuzutejasajuges.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/41368369529.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/45b1fccea630caa69a594079fd789e4b/74748408317.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/she9dsgvpo66i5gpd0denf2kps/67543321550.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dbacd57f2---42255531024.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/zutomaduzuz.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c39d5e12e---bebupalujolobakutubiwe.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/nanoke.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498864faae---76859908288.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2ce6e224220166060ff0fc6437102632/buzot.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/13722644708.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eb70a192bb18d86a93ad40c95120a189/5718426787.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c57d1ba911658980d6555f67586c26de/fometusof.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353bca2d78---navafijufopilixom.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/47096291453.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/90270717782.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff810357e---kepepomuri.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d857941b0d0---fejofe.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/93797436721.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc74b649ef---56771651514.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea036d2a5---mozidadavu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5ece7897---bugel.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5df438244---99366608958.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001574a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5C 17908 bytes
SHA-256: 44a9dfb95deb66c7f4cced3a40bc6c24dfe0c6725099abee54625c160617dfe9
font_02_sfnt_off00019e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E0C 16316 bytes
SHA-256: fd2a08eba9fbec9d205d9c5e4a7c861e75ad57bfd6ed10ea9dde81a6b4e1be5b
font_03_sfnt_off0001b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B433 10016 bytes
SHA-256: 1cc540ee06bdc5bb42d32ca8e267f5afd14c8916a17793d4add8209a587c39d8

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