Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9bdc5c8b0dc651…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 17:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18488f0ec58e7fc81b922df828a8bbee SHA-1: 23509049e9abfff37d93a4da2bca90ba8039693b SHA-256: 2f9bdc5c8b0dc651d854e9101a431d463301acd936897c7da5c2a62e1248236b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised WordPress sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=pdf+thumbnails+windows+10+desktop PDF link annotation
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8652a397b87f0dc0fdad4405d402dedd/41607642285.pdfIn PDF document text
    • http://starsunited.at/upload/files/9228781840.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/16691542025.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7a60e3aa0cf73b49b4642f91db0588ed/7314820812.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/jemadizo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856e245b32---42567981893.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/13806498771.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/40756730712.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/xaxosuxaviwejo.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/romiwifemis.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/30803899056.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/47125318502.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f418a4807---nisojupagetiruruxola.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/marosonadad.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a541c291192---mawoko.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/59699052142.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513a9053c---45091926717.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b76f83947---30971694388.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tupafexapiwa.pdfIn PDF document text
    • https://melz-feu.ru/upload/59161370053.pdfIn PDF document text
    • http://ossokahve.com/upload/file/pumatopuserituzoloweki.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/mawidaxuku.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zefolakeponu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16108ba0090ab9---rowerunona.pdfIn PDF document text
    • 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11256 bytes
SHA-256: fd3cf65a65f1a18f3d948a15cc75e5a46ce83da34dd9c9bc21728de8a99bc0b8
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 19248 bytes
SHA-256: 0d3b1d674b12f6b4cd5f8e4a92e4506e3aa1e594f885fe233b3661c812898f55

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