Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ffb8be91739261…

MALICIOUS

PDF

72.1 KB Created: 2021-07-27 07:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3b857dd524651e60e70784af0c009381 SHA-1: 61fc752722ea368016c4ebb7d12bc9d2f15bb70f SHA-256: 10ffb8be917392610e7eaaa02daa38ce4cdd9493e949bc925638e1d787519e5c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to these sites to download further malware or engage in phishing. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0d0fae87d0703873a4e2c0e6b7e0c5dc/13950333056.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdd2642f86adce1d50074ec4847f63ec/54641281795.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/mamozurobetorifufobenur.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/ruwikopoxopusivexiporo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee2daebc7---99696098116.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5ba55abb---debawolux.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/ruletezi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d869996656---befuzalogazojegowi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5hdfu3ar5u4d60899ho546hkn0/54564798301.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/nedebarazokiwizisom.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210619092155_m12mg3.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/78566353412.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vivibimel.pdfIn PDF document text
    • http://mcutech.net/files/pexokokuvuxikaze.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/vanesiku.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/28492464011.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64e3975df---fodopeketigilufibe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bojoserikimepigabaka.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e14443eb---92589305638.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/33592e287df57b6966b14d2dec26f716/nuzetezifewugi.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/92851255704.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/mixarolijuxudep.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071ea398f844---jovuxejotarifenexupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=almanaque+tematico+turma+da+monica+pdfPDF 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_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 17864 bytes
SHA-256: 9c1aedfb1d1ebb2c843040fcfb859cbcabbe7f2143c54fbddacc5155ef9ad4ed
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10840 bytes
SHA-256: 2225faf2be63a83f884f875f4a111311edc037df5981b4039c97c83f7da149e6