Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29a238fe5487dd9…

MALICIOUS

PDF

77.3 KB Created: 2021-07-20 02:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7af1941d8caea211b11d79454a42b40a SHA-1: 35a0c3733aaef030ddf1fe0ad584982552c8f40c SHA-256: a29a238fe5487dd963357fd722ee4ddc465ca1b808f59e070bcf1040cddac02a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. These links are likely intended to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/glcm1dnsavcr4hjtej9g7ldrt5/bajegonate.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704fc5ca328---23912933448.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608747a691841---36516748913.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m6bl4qoggr1qb6n0vcmgvtuc13/fedavinekafoxukija.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rowirurejetad.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gowafilovepefuzej.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ee8sfk4urb33hltsa1kj9pu6n4/30120136054.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/58867400394.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210504132802.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/9298469375.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/mumenuromodu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4b62a4dd---pazulu.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/gozuvejifipumutujulizozo.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/livozogaludex.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4cf1ee6486f8c76c0866a60537472692/93877441252.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kisununida.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86d896698---foxoroma.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sq6d8n9pf11bkia5qjo9j344cu/3064001100.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/wotalojorilatagatopugefuz.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jivesukoseniwezepu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c1593a39ad00a6243c1ad4748c77a62/61073045383.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/lolefanenutanewikutagatat.pdfIn PDF document text
    • http://willbramephotography.com/87802280422.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wuwalefefukibirizobidizi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7a7a20ae1398a169061ee0fc9b147c9a/99548337215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lactic+acid+in+septic+shockPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 16868 bytes
SHA-256: d15435c88d6a80d261552e87f1ae76d76a44308eab9b4dbfda06cdee37d2b680
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10512 bytes
SHA-256: a009fe9aebb0d81f33134275d1f6f396760e3b41cdae5adf979bdec9a33000d8
font_02_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1