Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed349b9a04bad388…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 14:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc78dc9ef9ca1778166ab627e3f11322 SHA-1: cf7b806015ad2b0785bc25f7850a448c591fe9cd SHA-256: ed349b9a04bad388b6e71f8f74f8db35c7a61e54e7b5456353f6302cc2724a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=deal+for+apk PDF link annotation
    • http://funkyspa.net/ckfinder/userfiles/files/texadezexe.pdfIn PDF document text
    • http://floramarble.com/uploads/dixowipa.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/22795886043.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/84767534549.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/50378770511.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bae6ce383f---warep.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/refuvafat.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28255091887.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/99225220543.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cc79d878b01ca87135c7edd7d9d5f5c6/21614990922.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • http://riph.pl/userfiles/file/fefajinenixovetexed.pdfIn PDF document text
    • https://akconta.com/uploads/files/12624627025.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/sitokoregozoperusoked.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12786510441.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/newezele.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902103114.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wozotawijuvogudogolarevan.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/mulevuraxevusogi.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/liwexenib.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/leran.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26353916731.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/dorug.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/90880879318.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 18000 bytes
SHA-256: c0e7273cfa4d55eef17906dec885ec6447d5c6aff42d33ab4c648178c76ee78e
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 9980 bytes
SHA-256: 21b61fea835365b1f1e59b3df76df4f2c519b4c530a638e73117d5575e8b9ede