Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f4a0597a328070…

MALICIOUS

PDF

93.3 KB Created: 2021-06-25 14:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1d826087dd59ce5a649469dcd280016 SHA-1: 5be7b168a15ff1e636ed9bf48389de30e4038b59 SHA-256: f2f4a0597a32807072aa6d0cb16a43d46a128af1ed440ba918338b9672299b1e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76f1d329062a0d62d329ac90a64d82b6/raverudene.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8635058668---jikesazimigesujoxepudifak.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/df44c3f20d3360223d6305529f86959e/xagezagodopudum.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/bedukubojivake.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c7367c22---83944513955.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5e09d0ff---fenezegokowarenowaw.pdf
    • https://atlastoursntravels.com/userfiles/file/sofesowajepuzorezori.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/v17b422fqmdvklprnj9s84bdq2/85087424485.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1044c10b---palopotekopewajudusux.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084242334265---499087878.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426e9cc6cd---vozalu.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/88bb8a946cb1dda7fdc18cc8c66449f9/86838392549.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/da7ac16d4218c5f83c7d0a096cd1f0d8/jitezubazo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5904c837---40137463957.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c31b44b42f0315a4090f3f073665c4ee/20665447041.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=reflection+paper+about+who+am+i
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb4.bin
1efee96e1c78d795f9424fb3a4d7d135710c3b5b4b0b730a291e43ba0e07ed51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16880 bytes
font_01_sfnt_off00013782.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
font_02_sfnt_off00014f99.bin
c24749bd72b950ad5b172ed241aa6b3afa7af4c19713ebebd4caf64fab69c6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F99 10948 bytes

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