Malicious PDF — malware analysis report

Static analysis result for SHA-256 0407d25ba419f02e…

MALICIOUS

PDF

93.7 KB Created: 2021-09-21 14:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a7f226791993f2f74b78d08af98b6d5 SHA-1: 05089b4263a4c2e56e4f6b0679ab7661005e278d SHA-256: 0407d25ba419f02e37aa8980b2a02e1c42d08c6b2fde54baf5b15a8c9f09e477
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cructi.ru/uplcv?utm_term=live+net+tv+for+kodi PDF link annotation
    • http://zhjpharm.com/upload/files/vijikiwikup.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/29933218418.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614155ecec32f---xurajijanadafe.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/83709564429.pdfIn PDF document text
    • https://camphacement.vn/upload/files/pawinuvuvibuwipajepodajis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134196bab455---81434415537.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/fozawitubukow.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/pixajozomo.pdfIn PDF document text
    • http://ge-mak.com/files/xenomanuxodavuvud.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/29055137240.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/97359723453.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/dofupedijomole.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/fipipelov.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161484b14cce66---marinamudawiminu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d653fe789c---fejixurekajawufatoxurise.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/6815511986.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/dumevasakipatakifaj.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/10118637787.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/kadezigovideke.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613812af69803---39411335245.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/72119476398.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/tepalomuwoxas.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/6429580465.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_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 17588 bytes
SHA-256: fa9b987fbaeb7135c1f272e0b40d51d99911788705b233221081106d18bc0377
font_01_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 10084 bytes
SHA-256: 2679bcf8926a4db2a218fb2d92165d25de48a2d54e0cc0d244778eb2c07a4b13
font_02_sfnt_off000150e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1