Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d45ceecf2f42b…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 03:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 217f73b1535e1d326c3e3cf36b8dc3ed SHA-1: 26aafb98eb44302e067ebfc49c0af9776e1215c2 SHA-256: a39d45ceecf2f42b743efe76e1949b1e7784e944d08def2541660d22f0b96eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://catamma.ru/uplcv?utm_term=wisconsin+emissions+testing+locations+near+me
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a394a7f152---ridoponezaxu.pdf
    • http://csim.jp/ckeditor/uploads/files/lirivevebawazomijeva.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d2565e6e93d---68090468559.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095b83a2080d---94950087037.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fc73850fbfad9735624286105a95915/82668473868.pdf
    • http://ajk-opakowania.eu/upload/fck/file/joporogokezugepujixigifo.pdf
    • https://airshow-bg.com/file/kutelufemusu.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aee3efd3a3767fe730dae266a5b8b8cf/wuvulariledisitidojuwivat.pdf
    • http://sarljarry.fr/userfiles/file/25765779257.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3891d49ffeae64fbe4115881fb62f5dc/josufagofomog.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/219329190ccf8133f543ba730b6a400c/wasedavonukiturazu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1d6c8b73357e766bd0ce497061f1cf47/pegizikaboziwusawa.pdf
    • https://advik.net/userfiles/file/74918353458.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/21ad09dfb5ac8f7dedfcbf549d19db47/55492914645.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c552a35f48---muwowalilevuzokidajoj.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b57b1981a---ribifusoguzofiz.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sj9b9a9hvr2gp6hmdqoi0fb2fs/88593893900.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077257797fa6---feladupogagoson.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8iaq811bsrn1mtfoj543pd3af0/bisomiwat.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8954b258bbb678b4064b6045e05873a0/93097594312.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608552f7e6ec8---2037289074.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/8458777357.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ecfa0d2aea3ef7e5759453dd85699798/36002276120.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/40da0s50e2sr1b36nut730o96f/jepinovemizinakanozonajix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6d.bin
9e41c24f99605ab9a703693e1baeb511a0f5abca126614e0ae38c25249a92773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 17080 bytes
font_01_sfnt_off00013ab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 16792 bytes
font_02_sfnt_off000152cc.bin
78d98a5122cea36790fc604b7588c8db961c3b2d6707cca8b84f9521babb3f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152CC 10564 bytes

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