Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f66445ff6c5a9…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 19:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a136aaee39f2c1ecd9d240e23c821e26 SHA-1: d5497d4f42b8b0c512de149f2ca306bbd942720d SHA-256: 054f66445ff6c5a938cd6991620556b927138027e4dae320bf3874e8eb88dcac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on compromised WordPress sites or disposable domains. This suggests the document is part of a link farm or SEO poisoning campaign, likely intended to redirect users to phishing sites or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=mugen+train+release+date PDF link annotation
    • http://elsped.hu/files/file/luzabinedejivodem.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/bexogezimipa.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gazavumazogasodopurek.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/87301481487.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/74805392157.pdfIn PDF document text
    • https://service-panev.com/userfiles/91771830532.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/79662904464.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/pumovogofedapagapojuwal.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a180a1df6a---migoj.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/likinovime.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/tagixuxopipigor.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/ruwujosexegulikumapigifi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/pajoweridilivijo.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutisupalerib.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/92677732122.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c72ae46---fapesumemegobexi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bc78a86c---jogiv.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/fezusok.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/vitivuxafosuvodopaxi.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902195721_640555.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a267011ac3d7630e6c8cbe72ce85429/64118371688.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/5160993218.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/42713313342.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/81764286442.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 23308 bytes
SHA-256: b5317bcafb51da9e05dfd27c5035cc8c30082c805179bbd07477ee0a8d178503
font_02_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 10396 bytes
SHA-256: dfdfa15e45461a9723bf2bc872a115b9582643d6492ebb80edb5a7a63aae908b

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