Malicious PDF — malware analysis report

Static analysis result for SHA-256 263a8e3275bba239…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 17:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b9c0039f0986c19d6440b44f19ab0e SHA-1: 98d31eca68ec295963a07f8e2fe6f38019796353 SHA-256: 263a8e3275bba2390549651c3b17025edc88932f0b4d0e6dfa8baaed34a288e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hrmconsulting.biz/upload/files/zefoxiwemi.pdf In PDF document text
    • http://chroscina.com/userfiles/file/legajesom.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/70952471425.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/66c6fa57e6dc2402974b033ec12cf7e0/64350774171.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/563ec78a1939ef723c98505631541878/72853030532.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/65996960439.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f15153605---61378075649.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/puwunevem.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/70315233128.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ippdrbfhv6o1bd79pd3pggvot4/rifapobanuropobudupaw.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaca451c41---zulubixu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab790c6f32d---20069625228.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/rakepakexosasuwagipo.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/58690833686.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/nibimifoxolunifabawigori.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/37841491517.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/doputela.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76bf5a181---voralamuvewewoxudef.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/ribare.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850bb29a9aa---99994056381.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zafavebewome.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7489dab961---dofuvosafata.pdfIn PDF document text
    • https://tepihtrava.rs//files/9090552461.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0306a8d03c00c1ce070a48211151b66d/wonolemofodimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=percy+jackson+and+the+lightning+thief+castPDF 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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 16748 bytes
SHA-256: 809dd38b3da1935bd07735c05d9c74f58801529f6f19c30a02147c7fdc440e13
font_01_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14023 11092 bytes
SHA-256: a74ded4cd85cd3ded713ad7a3fc6f65eca5c65a47f25cdc8e7af4387456a1a16