Malicious PDF — malware analysis report

Static analysis result for SHA-256 182716bf2d659531…

MALICIOUS

PDF

71.6 KB Created: 2021-09-14 14:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5777f5cf39707c5e81bf799b92b6dcc2 SHA-1: 458835731abe538101f4b17c4c5533509e5a410d SHA-256: 182716bf2d65953138d2500a03c7ae03b531bb1514df88b70f8271537560ce93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a clear intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=android+gesture+control PDF link annotation
    • https://tatsolarlight.com/uploads/files/23404090922.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/kakitavimalinipofera.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/ferotaforazuw.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/61869743909.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/15618002861.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/zidipuwerenodiki.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/60059888538.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vedosemotuwudujobeberi.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/lebavatunaxijeto.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ee2b95b9---wapasuzijovagutitefuwo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e335fb3494---42730524549.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/dexajimapamuluxaminiru.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66572e882---kenafenafufitinijoxivip.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/nedifowivasujakezuviv.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/64332467521.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/lusofefir.pdfIn PDF document text
    • https://bliznacite.com/files/53369478532.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/77942687460.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/412dio8uoosu76obas5cdub811/bigupafatoporajo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ouuf11uabh82cqb4qd2e0cd3j/nakimotipivexipatafave.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/40559910631.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/12727143883.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/65042664274.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_off0000b977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 10464 bytes
SHA-256: 12eedab991dd1cb3eb2ab9275c2ea0f3359c5a38a88dd695fb3df28f9ac8dc0a
font_02_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 15624 bytes
SHA-256: ec108e1636c42517a40d4943000145b2c92609f32e08918fa54d86e7cac4159c

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