Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b00aace275e393d…

MALICIOUS

PDF

87.7 KB Created: 2021-07-27 21:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ec0e26d1b4fbc263310e80d365f0eab SHA-1: 882eaef6223fb2e622bf6b0f566a5b443f85122d SHA-256: 8b00aace275e393dfa3563a8724a575397071ba442a82a947ec4be97afd06638
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious payloads. The presence of these links suggests an attempt to lure users to external sites, potentially for exploitation or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2p639fiutjk67g862mce4afhdd/81852478552.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7fb4466b82fb504136a06d1321db3e39/matirevopawizogu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e92c274c126024d109daba8753b8d514/21835477909.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/50544938105.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-24/20210724094924311219.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/12745bd0400e14764d659bf8abfdc390/foxarofaxudeler.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083325e837af---55056039388.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070118035225.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cde9463da---10358664114.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/vebulopu.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/54503836086.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a6b97fb0b9ddcfa2d4fdf9eac80b256f/fobibison.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/6238520134.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/35374634485.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3343121bfb---57858509422.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/nomivokakoxetimisozulu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m4fv1n43uu925s97ri4pbc3m12/davofozomokebep.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nusukoluwew.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6321bd3a6b---xesuzisedewoxetosetimune.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/judomuwulikavugikakila.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf9b1c78fa---71921664622.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/srbrgjvjqkph3v0gfh6kbo8h5n/wutetekevobu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631b643975---fenezujolimakekopa.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zoleni.pdfIn PDF document text
    • http://954move.com/clients/4890/File/95199324499.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf8cc78aa---nirojufiwizufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=8d+audio+converter+mod+apkPDF link annotation
    • 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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 17332 bytes
SHA-256: 2e9821fc719979fa67bb0c16c587d9ec0137d22ece10dab58850b1554636d6ab
font_01_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10828 bytes
SHA-256: 221a72d0edd4fc5017847ea8fd7147a715176a73c4bbf10b02c0083763de7eb2
font_02_sfnt_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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