Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81a18ac18b4e1a6…

MALICIOUS

PDF

77.9 KB Created: 2021-06-05 01:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d4d3afaecbb2f2b25bbb6abb23b0c0 SHA-1: 6194217a6262527b8bda41651955f71cb61f0f62 SHA-256: d81a18ac18b4e1a66ad02138ee73c6faab4a02a5adddb1b2663c599a56f9b899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which are compromised WordPress uploads, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of external URIs and a link farm on disposable hosting strongly suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=wheeler%2527s+cyclical+model+of+curriculum+development.pdf
    • https://parklanehotel.asia/userfiles/file/60442380227.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7108ef750---taxorijij.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8ecfb6052e58aca59ba28d91e017aaa9/62146348931.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076836068d7d---povudewitex.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebbbd39d61---nowivupatowifevukesu.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d17f7e923be431f4f84c649687d8494b/dirarasada.pdf
    • https://nbtele.com/en/cache/fck_files/file/56384001863.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1b5608827b76c0013934c9871cd569ce/jusigelavumukotawamavudog.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6d01d30f---66327628668.pdf
    • https://dietacud.eu/upload/file/45239872045.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9f9e344040e77d2d22bec1a6b465d1eb/91972158554.pdf
    • http://bitite.lv/media/txt/122/file/79482417640.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a903f3f28cd---gikepelepijopanamemorofu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66c372c99---fitabow.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2969c809---kumujenaworawowuvopadixa.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d3ca7b77---vanubojonogilewatumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19c.bin
5bb2c9c8d2d6f7080d6a48e544f65bfe97c8c43ec3e67df3e519000ae2b94500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5636 bytes
font_01_sfnt_off000104bd.bin
51994b14d7f56b4df6c7d0cf11ca836e8685dc0b0b10f8cd1ad9ecf311aaa0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 11256 bytes

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