Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee6a68b7356f9c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 07:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b5f9660da6137bfee64a81518873935 SHA-1: a41fe440874de10fc7d5b278b4fe69f00bc160de SHA-256: 65ee6a68b7356f9c6d206dbdcee87094c78d7377a613acc5aa2b392aff63eb92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs and link farms point to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators strongly suggests the document's primary purpose is to redirect users to malicious content.

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://drafthe.ru/uplcv?utm_term=walking+dead+season+6+ep+1+watch+online PDF link annotation
    • http://cortocircuito.trialpanel.com/images/Upload/files/nukapan.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///65159005881.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161495cecb0be0---rodojaj.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/82161319179.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/87464655285.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/46329176806.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd66f63c98---mirubux.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jasuvixofalotebuv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a4319b5---mojedigadavunarip.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631912317_692d7ee351.pdfIn PDF document text
    • http://besteva.com/upload/files/56814651282.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/18330597360.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tekorekiwi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e491fef657---buxudi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403ddb08616---rezisafomojakupoxajox.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210925105951.pdfIn PDF document text
    • http://bushurov.ru/images/files/51302115042.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/43574496495.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a3d075ae1c1368bffc16c8da2e877252/8816972129.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/89248251718.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/pezefivexupaveporogipubiw.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_off0000ac78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC78 11084 bytes
SHA-256: b5caca6ddf6f77ea461ee05ce5dcb5b5a13e35671e29702245e0ec1c3835af16
font_01_sfnt_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 15780 bytes
SHA-256: e63e999a1826d523e00eb715fab6475c57c98578cfc096eb0cb0a9fa62b3bf50