Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea765a6a20d708a…

MALICIOUS

PDF

80.4 KB Created: 2021-07-16 22:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fec8fa1662f12ed621011761d10a009 SHA-1: eb474263aa72bb0c7bd6e825e9d72d9d3224dd8c SHA-256: 0ea765a6a20d708ae39b0140a8a9f76ad56d573b92b40b70985f8f32cbf87bd7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution scheme, likely using embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/77b590db7b9de182b24909e1042802f3/kaxozamasod.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7236ea8c4f8fbb3779b07a96e84a99d9/5889039818.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u91om9drtsb5e7mms5fbte2s63/boduzolinatuw.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/99053572846.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mamefudinepisukabapi.pdf
    • http://mientrungland.net/uploads/image/files/58160844081.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8d3afa52f11195856989115af6c69ae/89120368382.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/sefonadatutoviguzetokux.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080d81c79c14---86291357419.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094344327cd5---54620921218.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5qa3la9pick4rea01f7i6drmvp/gosemawuzomerexoku.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087992dd6bd1---15917364126.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/keligoduvewaxovamelabeg.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9huo1daqfp7p09vv2g8p3t0356/18146907162.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/g1bk905p5226aokc9kjvqpmb0c/911108670.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/86198621778.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e1047662---22784607755.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f29b3cde6857a00965765ae44c450a11/kobonak.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/464fc39f809ec44620dd2407fd71d229/62094963646.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b96c29a4---32855829195.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ac81961e---ranugibudewonero.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a5a3078bff610a097d5de4014ee730fd/fasenuvenebop.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/39e2de376da7646c1f016dd59bf0cbe2/lojonowesiz.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/edab45f2bd31a66e164d536a2caf8da5/71398283212.pdf
    • http://mgocsm.in/userfiles/file/60448242843.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+league+of+legends+wild+rift+apk+for+android
    • 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_off0000d4fc.bin
c8e296064e33254695cf923c4de11bc06343c0e23eaf9fec86cc3e940aca5dff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 17416 bytes
font_01_sfnt_off00010287.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 16792 bytes
font_02_sfnt_off00011a9e.bin
99c2a78c1b9d6058ce3bc1effdfed2249450991f546d374eb42cf8fbeb3003a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 10952 bytes