Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8675485e608ace6…

MALICIOUS

PDF

136.9 KB Created: 2021-08-25 20:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7013ccfdc7d462ca5c32fa813885f65 SHA-1: 5518c5d7db93e9047fb161337ebbc6f0f8dba431 SHA-256: d8675485e608ace69463530983e03abb18f479ed0b07bbb963781133e762e98a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bssgkhc8et9e53tuv1om9m8bs7/famitivuxasimokize.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/80609804680.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/po1ct6rsp3n9vinitm97j82go0/87654399206.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/sokasajemujikutasivi.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/jagaxoxajizijaxonuvoxugid.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/50703670617.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/riwopajizizije.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1612a36e58---kitoregunase.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/majesiluvomanajezikowenuw.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca9834f0e---lebuwa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/naxos.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24b4560f8---zabaguwogiloxegos.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160817e2f72b2b---luxazixesiguf.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/87250058781.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/6334036738.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d611a295---dujajusiwumoja.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/suwedaboriwawanidoluribe.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160870a0046be2---36068546541.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b7515c8c7424a4e044ba682e03fdc5b2/vegexekolurivomudejaja.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d61d5ebc2---15223111335.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bimipilixizis.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8517c5a1---vovafexipafewagepokox.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cce420ad6---xajafesipomugigarase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+rate+constant+for+the+reactionPDF 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_off0001b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B854 10352 bytes
SHA-256: 74793ddc9f0fa5d26c2b848853504861ba69df20f22647bac0e80bbceb9105f0
font_01_sfnt_off0001cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB0 17712 bytes
SHA-256: 9135daf223d57a938997c3158909546a301c55a3ba39ff16b73e26a5ffc21ec5
font_02_sfnt_off0001fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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