Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73dca3cc461c0a8…

MALICIOUS

PDF

82.3 KB Created: 2021-10-05 16:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7fac2f3fc190a7a536275cd8d0007456 SHA-1: 69676ee1612c10268ff3037e218355de2900a033 SHA-256: b73dca3cc461c0a8d7b333fe2f16a6e98cd74dd6241dd0380ecbee958f985bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://zekejozsef.eu/FCKfeltoltott/file/7456413640.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/692b9950925f5a7bd87a62cc4fcafaa6/sapepipuwuti.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/33072973711.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/65047142687.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/73305889896.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/2654673159.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/54475740272.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/85104314006.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/46nlvg6amo7pkfbmps58c6lji4/61426212644.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wawoxowegowowime.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/wosoviwasutinososov.pdfIn PDF document text
    • http://shopabrang.com/images/files/galugokipe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210909_75864FD11C11CA57.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lavasojowixasowinulomi.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/45814949247.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/21121796557.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/gulubugavejafuwonibuveti.pdfIn PDF document text
    • http://fourfoods.com/images/files/virurobifidatod.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/zixatagijopewusinaresasa.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/81702033788.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea0f796595---nixewutezigawoloniguzelis.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/77230835582.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/gejisixabupefadomef.pdfIn PDF document text
    • https://0900107678.com/upload/file/linix.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/52483474836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+bankers+book+evidence+act+1891PDF 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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 18952 bytes
SHA-256: caf479c05112d2190735ce5d80d703a1cf6f007b2a52260d7a4dbc215b8fbe30
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 11112 bytes
SHA-256: a7fe866814fd545f2fe032dccece1b13ffdf2fb8affee3d9f86c71862926c76b
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1