Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b4f5d67d43a7e5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 01:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94d08268a09ba71f92825cdfa3e1feea SHA-1: 5882454f90f6d85b7fdf2c31c98c68aa7259912f SHA-256: d0b4f5d67d43a7e579ade034c9dc5dd02891cd2e475bf213c10abd34c325b9a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, suggesting a deliberate attempt to obscure the final destination or leverage SEO tactics for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://circolosilverblufitnessclub.eu/userfiles/files/69253332845.pdf In PDF document text
    • http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
    • https://majubesar.info/contents/files/wuregovokuzamoz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8bf453a99b1b6ae7e35e809ed08cb689/31922488450.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dupebatimeseruto.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/zitepedas.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/85051756963.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210902055115621658.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16716164375.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/75526258267.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/fabobibobupi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692070b74---68193400562.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/39a7b5171bf02780120570414bf5cc2b/kixupob.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b0ec57e0f776b7b71468266c3786afae/bamalilus.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/volapunabogunoru.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/92473642136.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/27893010194.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/33382269457.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/74573142642.pdfIn PDF document text
    • http://chinalabware.net/d/files/lusagefake.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/boterukidaleramopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sync+contact+pictures+with+facebook+androidPDF 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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 11276 bytes
SHA-256: beca7b12bc4be5159032609b59de219d4ca7ba27da750ef228e7f90d0efbf4e9
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 17344 bytes
SHA-256: 9401c1c3f5b9941c2e5c80ed326dd6d3e774dc3fac73c4aa855b33eda87a9784
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1