Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b13b2164d3a4f8…

MALICIOUS

PDF

94.9 KB Created: 2021-09-07 00:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3e4ac14ad0c92beb960f2eedac1ca18 SHA-1: 64a90c979fba23509babf38a19fa49c46df2ad15 SHA-256: d7b13b2164d3a4f876ca583ddda764cf72e7f3063daa77a01875c0e92362b803
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=the+powerlifting+program+design+manual+anonfile PDF link annotation
    • http://alimentosldm.com/userfiles/file/80889001308.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/5qgdg1et1b5vsbd9ae0dfo1keq/41756424488.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/4169510025.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j6f07hph112930jua4ffev6ugl/dewowabapoxenan.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/502ea5d313fdd65eb9bc60845ef238e2/nifugeruf.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9umvieto2glhom9hejlbtka20b/11939209071.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jidoximurukisopalesi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c678f8c0cc4---nikuliximexatoku.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/xutexowetitalamomimom.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/66630324467.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/kekadozobidedogepefu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/jodipozijokubawuxetuwo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/pelawobinizerezapofi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/aae4e66900022e49a06b8dea8f027b24/84049952761.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/13044409245.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/kedovupepuvopulenulefonan.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8d5878232---neririkisatagu.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/desirosega.pdfIn PDF document text
    • http://unsersohn.ch/images/file/96836746937.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f6ab1ed3---nefew.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/legetorifiju.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035cb9e3d5---rolilitusesomabibusumamup.pdfIn PDF document text
    • 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_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 18652 bytes
SHA-256: b7ebab5e63532fdeeddabcc81cb91d9e030bb7f4fdc6952033b54a38cea381a3
font_02_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 11096 bytes
SHA-256: 346d280693231a26cd41400936854ee4410c2a64ff1a3da6a2e93eb8f3ee60da

Open this report in the interactive analyzer, or submit your own file for analysis.