Malicious PDF — malware analysis report

Static analysis result for SHA-256 98682b4a3f09809d…

MALICIOUS

PDF

125.1 KB Created: 2021-07-15 22:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc9701900a84ff110708845f08c8fe9d SHA-1: f0e3656ebc79a02011112ea18a3b628efdf02686 SHA-256: 98682b4a3f09809d90cc78f0309bc2242e3d9ac11fc021375bef5fe15b7c2466
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or distribute malicious content through various compromised platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2780f1c3c071fb789a44346b719cff08/4097781708.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772112bdf84---rovanedorida.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/dab477e334646e174f4c50a27ba190ea/84373870970.pdf
    • https://alianzatours.com/imagenes/file/notisuwuwufusipori.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eb9cb02cf3b35b6762dbdcc8d05ad353/juvexixub.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea028d264b---50455829351.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1299d1d71a---pokidatojubirowin.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/dlq0iseflno2s2p39a7dut9n61/jobofagufel.pdf
    • https://ivaco.it/file/26664263967.pdf
    • http://broorybulldogs.com/clients/33993/File/nopavegolamode.pdf
    • http://skolicka.eu/foto/images/file/verisakoku.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6f04a6423947d7ef4c00fb4b9b699f9a/guliru.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d83e6ade---xutadek.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/4hcb0e9t7un8582jjeoo0u0dok/38062612342.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0l3mqtr4sqfvevb4um7d14lfg0/77605129794.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/34q2tb2s81f5i4jf5e3iv6emmu/7973811014.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/df7164ce56d4ac7cad86ddebb29e234f/89679499131.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bnmgfhmacegpek4u6m9lehvi15/57649323961.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e850efeede26b7f0a38297437e0a938c/toxanesudexekizo.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a136516---jadewapugoxeti.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/vadagaxakexajusegedupafi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cf61818e.pdf
    • http://surtek.biz/image/files/20150130_072121.pdf
    • https://megalightgroup.lv/uploads/files/juxibitejepezuluzi.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/66673908633.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/67581136356.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb4e01c5d---61536916492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=french+ipa+chart+with+sounds
    • 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_off000162aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162AA 16792 bytes
font_01_sfnt_off00017abb.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABB 16244 bytes
font_02_sfnt_off000190a3.bin
868ef3dd2bc0e4ea4638db6c05c30328881ca0c8101b70c14eda006f102c4570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190A3 24548 bytes
font_03_sfnt_off0001cdc2.bin
c4a206457cd2f32c69200faf5ae32b6bfa65e18f0e405d4033a0b6345475127c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDC2 10728 bytes

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