Malicious PDF — malware analysis report

Static analysis result for SHA-256 9106b8113793af77…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 04:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f9a9905ef73ab20b203a16b05b26f95c SHA-1: 8fe0e71681d9b8f9ea964b1a67ce2d10b4c83182 SHA-256: 9106b8113793af774673eebfd2fb72333c4985aeae56825a64b0e07f29ffa0c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pixomot.ru/uplcv?utm_term=discord+create+channel+bot PDF link annotation
    • http://pxmonastery.org/CKEdit/upload/files/xotukumirudivatilajufiz.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebea3a5e0---87847028613.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/068740391efc9cfe287813ebb3b13feb/danirelaje.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/laxugusasirowuwefe.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/94395484079.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/pizurekaloruwovomiwajim.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742d795dcbf---lomukovowojidosiluneg.pdfIn PDF document text
    • https://coluer.ir/documents/file/13460242002.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/ralelolusatifakituwiniker.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/d41b47b17fed9476f50324c463a55378/42957327174.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/16916d6d543240a779c6d9745cb499aa/22948207828.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/rexoxetuborosup.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3432efd95f59e74ee26f887fd799080f/lasugomatadejupizomas.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65206416424.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ib4ruvdcaov6ropjodbsi7pl2/dusonunat.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/74595246192.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae053cc2e4a---58450222023.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cc1b31---17646185610.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/99100230116.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c21597183---49784549377.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210708074951.pdfIn PDF document text
    • http://skomi.ru/img/files/file/bupujuxavewizomesenodep.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0cc32802---bagarelugorakijekav.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/86dc7148073dd0f1b7dc4b4e0c42d21f/fitejomiwelixis.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/muzovosedil.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/2651272810.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b1fe0820d8e4b576e95e93314e90348c/jufajiditotivoxetutabuti.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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 17596 bytes
SHA-256: a8bd1ea9526fdd8edbfe8b71dcaaa9cb8e3532ede6219f7b937401b86738f59a
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 10608 bytes
SHA-256: 79845ca7252b6ec387d1bbc1c5d5ded09137158dd026ca10a58f66e36b2aff57

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