Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f97a489dbe7d6a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 04:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9e0c13a09da944291444d10be70c162 SHA-1: 4d17e584c33b2952c0d0dfc0b12dbf6d44b02322 SHA-256: f9f97a489dbe7d6aa5ee4343f07c48d09feb58530e87288c04d1f87b33c5184e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=chopin+etude+10+12+pdf PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc3e64978---44478330452.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sarofolof.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a79597bb---bepivotulewefuxi.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/85527865398.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/banibig.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/9299015409.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/221b4474a94219ba7f3d452e6a49625a/70475785685.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/38792486758.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/93e5080e8e2fb97ed19e23d7f4d4142c/ramobupezalezokonibipelir.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vfetf33spda6rqo24veb5kkglj/wumitujogepuw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e09007674---76899388978.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3ada2bf3d10fd3327ab0c5e7ecd655ad/nizisarenagamo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/fa8c48b92f5f98a09a1fdfedab0bfb53/85312793494.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c893d27e84f38cd5434b334fa4f61257/vugoma.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fo7k9i29a3rgjaleb0um73m7pj/busigali.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/77544577994.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/raxexowafiv.pdfIn PDF document text
    • http://industra.sk/userfiles/file/67256816484.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/nixajiguf.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9cd4dd1f---90691276721.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/76875332825.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vidagapolew.pdfIn PDF document text
    • http://groupkaishan.com/d/files/pakiwerojubupelum.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cce206905e5---25342029158.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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10544 bytes
SHA-256: 6275fca2d28d9e2e701a678d2fe0afcecf9472433117c00606957dfc6b53b598
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 19424 bytes
SHA-256: d9eae1a478d4eec1a0289ca6681e3bbbf4e2c702ade8d9848dfaa79e0eb4a88b
font_02_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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