Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e546af2d4d26d9…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 12:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746c240fe403f4edce35fa3570ea4a00 SHA-1: 61fa3f9b581c75859c57158613acf98e28a1792b SHA-256: a4e546af2d4d26d989865e4b96eef9ab41c275095ae63f97e94aa51093575244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF is designed to redirect users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://archism.ru/uplcv?utm_term=capitalize+good+morning
    • http://ramenzoni.eu/userfiles/files/28704619421.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4a83bfe8d4d947f4bfe8929d11782bfc/36135528296.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3084e7c8---87957659821.pdf
    • https://agrilaui.com/userfiles/file/giwidij.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160dacf2681d68---62273304051.pdf
    • https://datawire.gr/files/files/20886230647.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c16fce93a3c13661285ddf5bca1f2444/92109612940.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9f860db6f9a3ee3d65feaa8c6e35502c/sixesuzeparuze.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30f238424---54185389201.pdf
    • http://www.sport-konyv.hu/userfiles/file/76843105124.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1a39fd72cf467f962a9dc250eb0e87d3/povirapagadur.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ripumk8qliagfdjtl2rl7soj6u/75746769363.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2r6tebg8pca4cj1j5i3u0rmok7/32997549233.pdf
    • https://aprilboya.com/userfiles/file/25711407351.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/68b4a85202bd7d175d7e0485cbf4a631/98067569344.pdf
    • http://glcore.net/ckfinder/userfiles/files/divopepozelu.pdf
    • https://fanaf.com/article_ressources/file/joxemabuposixewobeb.pdf
    • https://kovtec.pl/eurostyl/photos/file/rovipubexefutunof.pdf
    • http://openendrep.com/userfiles/files/pegofigesarenokoropa.pdf
    • https://aradmissions.com/ci/userfiles/files/83813287688.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/68e5b55d98be0d6894a2fa47aa1f8a9c/rezibemodifebogogiwadaz.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a441978548533da2bdc95b7e320b355e/56661195017.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0c.bin
e65c7be4276a26764b87d533dcda46c29d1c1a9811d79ee09ec295be0405c181
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17148 bytes
font_01_sfnt_off000118ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16792 bytes
font_02_sfnt_off00013104.bin
95dc4cbe4ce91a581fc8e4781de57b9f72d0e180c7eda59b543ff3b5647c5177
pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 10660 bytes
font_03_sfnt_off0001492e.bin
5cd4eda3d8e27ba61b4883b584a00b1c947233f8a398fb633349b70599c2ff4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1492E 16708 bytes