Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5e984ab08a3b9b…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 14:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad1c8e0dbb507d7724fb17c529abe093 SHA-1: eb9c5db912660ee9a2bfa15ca5319bf701300086 SHA-256: 0a5e984ab08a3b9b61a66c8737a1e0574699388a8676f05d50ca872bafeb308e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to redirect users to malicious or phishing content, potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5cf465fe5420f64de70c62f680a5520/labeluxibosoval.pdf In PDF document text
    • http://104408017.linker.tw/files/28751073935.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6cf1330e49440934cf753bb58b9cd647/68914899414.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mllh9obfc0q737lcfmjhqi2l16/diwodegujopogonaziwonapu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/gisimukofovalewikinanowik.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/10140658837.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/03f20b7168410149ec3c549d607fc02a/nelitidewodidazipojofo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tbmhvlmdbqid12fvvs6vpoksqp/34486267085.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998ea0ad49---fixinixibipabewiduf.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/pefaxidis.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d381b4639---44404179168.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/ganoxaremifomipes.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd71caa788cb35bcdc78446ac8a7930c/99677102427.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8695f4031---vitokoferovefu.pdfIn PDF document text
    • http://wxjsyd.com/userfiles/files/lixazakurikupuvuzesogam.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/titokiji.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/xadivekubedasawivezipetow.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650730711---7537354894.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/25541113594.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/zobelatakosuzexukoje.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/63lf6djfdshgcrmo2oge9mmkkj/11213390561.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/25907286662.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/2702603313.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3aa0548096acf5556856bd061ed39708/51528193786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=donde+puedo+comprar+una+churrera+manualPDF 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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 18940 bytes
SHA-256: 23f9c41ff0a846ecff7424b0c26d5c367fb41b1f58341e089359362f3efa933e
font_02_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 10520 bytes
SHA-256: 9d349839b0dcb9ff6d1272eec9f54905a2c355cf4b7e56099803e28515ddf384

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