Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a9f7c3f37ba04b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 01:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13feefef71c9cafbdbd4057d404147ae SHA-1: a2386d71721e98d72d5aea5783486e2b7d71b92a SHA-256: 72a9f7c3f37ba04bb5dc508d878ef682c7e19078a698418b82e38aa0c38de995
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be metadata from wkhtmltopdf rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=crna+vacation+time PDF link annotation
    • http://spalovnachemolak.sk/userfiles/file/wigutulefisufirofiguwali.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v39d29nn14gk0decgntirtd0sb/karuxivomefis.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/vidibemaw.pdfIn PDF document text
    • http://scro.ru/pic/file/gipebolirowum.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c802e8e3bd---19647593561.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/22166832567.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/folazafemufanibafow.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/69afd4ea4532660c4ea750f6d0d6e2a8/73100525865.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hd5qi1cc5o0u8an3ijo8u1ddl3/rebalaladurodikunizotamet.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1fff2d76---35008620553.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c82f0a292---dizozimifanosevopif.pdfIn PDF document text
    • http://jucal.es/images/file/31340400864.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e06101a7aaf42325d71b6172a14c7177/xufiler.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/85135452232.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/20d4ecdfcd0b7d8a74c6c987cb0e770e/zedamawowonozi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/28037223419.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086115f5d7---judaluwabisagavazonos.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/25640300129.pdfIn PDF document text
    • http://charivne.info/images/file/wasupizobapepizidejuda.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vigobakotev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713391a8a0c---saxiwis.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca95862d5---bujutexiwijozubude.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162344365797596933522.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dolowele.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_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 10272 bytes
SHA-256: 5320a4d4bd391ba604e3826c040e09452556f5c2d151659510cba0e43de11c98
font_02_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 17316 bytes
SHA-256: fbae39fecaef8a0bb4e6d86025e428a7920165148fec8d7267bd899a8ee08bb0

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