Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06a8f18b9d2b041…

MALICIOUS

PDF

92.6 KB Created: 2021-06-29 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f019b4b893e7f11572236fbc2db619e2 SHA-1: c19e77dbeb1d9a0add24804f28f9aa9f6675e231 SHA-256: c06a8f18b9d2b0415fef199f841518173fae3f577a4a0f2d092cbb7741d36e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

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://medvor.ru/uplcv?utm_term=csgo+give+weapon
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/wamesuvovukenigaterimelut.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/615e79345abd4df2f6878a6a8c4c3868/rebivogumiruwajodibi.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160989fd83e1c5---53313660812.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b930adaa382---72725060466.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/82a1cfd8e8cef677d49fb478226647a1/bulolozagomijava.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d1e8b016017653c0f5bbe3525fcc42cc/776702177.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddf934856---78130413303.pdf
    • https://holocaustresearch.pl/nowy/photo/file/22729643190.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/27e7f39cc14b917dbeab95977ac45b63/12320197368.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c6027ce6---60771509808.pdf
    • http://studiolauramoschini.it/userfiles/files/61181283539.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c985be6a134---tezojatubap.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4cd8b8ced001f08f289b472f80b22932/jinajotifexerejefuxubupu.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f380cd---72823062899.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f77dc72354900fc382b5f5be6a868421/fogulujur.pdf
    • http://beiks.info/public/file/fagubaninopopedugogi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083953a11140---mutazaramevo.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec115b9377---weladazor.pdf
    • http://aggengr.com/uploads/CMS/file/neninutomakov.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3149a8188---lidivipu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785352ae8e4---jokuvikotisebet.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791e295709b---zadarikiputozol.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_off0000f28b.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16164 bytes
font_01_sfnt_off00010801.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
font_02_sfnt_off00012018.bin
2f23d8046cb281caac67739accc6842f77c519766c887697dfa51263f78ac74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10364 bytes
font_03_sfnt_off000137b6.bin
9cbc426dbad8f624cee3830f910f238c470cba78b292395662dc25b46eae0374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 17328 bytes

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