Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e420ced54821f77…

MALICIOUS

PDF

87.2 KB Created: 2021-07-18 19:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ceffb3a2abfaaa7b85620db8cf1c216 SHA-1: 0e9ce0525d39a113e35527fd98343dbcbd20fafc SHA-256: 8e420ced54821f77093740319bc924029d2886f1c2c5b159c7999fce85516613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. One notable URL is http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09d3fb16c7b8d1d8e06367db3c40be98/nixegenumid.pdf, which is also identified as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09d3fb16c7b8d1d8e06367db3c40be98/nixegenumid.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/83edc65bd70a4d09f53aa2c33fa4a570/furonamabidalegib.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/65423298869.pdfIn PDF document text
    • http://www.asslar.de/downloads/regotokokagitavewonejeses.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b244ba77e35---83578005.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/33635420264.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c965da48c0---liboruzov.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8770176060---niwopetolaj.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/30408925052.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6h88bisah1jvnd1gll479uh66o/73676040919.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/68180250422.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f942163acd8c4890351260a1e965f997/72797161405.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210526192151.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/80591368931.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/57d250decd95337fdaf677a0b0b4228e/sikonafuw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9a5221cb---xuxorepoxe.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608940b572546---zovug.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/26827090720.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/mozukerutojude.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/wepufaxomitotirufevoruj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gezizixelidezitolugum.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9na7bmod2j0fp5gqjc1aie7bh8/10674967442.pdfIn PDF document text
    • https://medius.sk/userfiles/file/50069973994.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06eeba76c---miworuvodudavab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=warzone+cheats+for+freePDF 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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 17972 bytes
SHA-256: 65f3a0a6f413f57fc2313ab0d9ea72a61968933ddf9de77e0c6c36c04cc853a0
font_02_sfnt_off000136b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 10348 bytes
SHA-256: 31567b34aaf12e2f75da05751a231505fa3f27ac299322fc7fb2b00aa5a4fbd3

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