Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea013041509c9c0…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 09:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 377333aca3dd22e7d6660bade3a1724e SHA-1: 017f509178e9b88ec68f79307b63970ef1c00799 SHA-256: 1ea013041509c9c07f09a597b8707cb939110d95bf142067280fcdc7aacf4f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The file's structure and numerous external links suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://venturahigh1967.com/clients/40640/File/68874264125.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00c033c43---pojuvexexobebudi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4b1c61bc9---41974029317.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/16278990181484177239.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edf6b1032bc---43384174788.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/e3be52b1da7684dbbad0047ff6107d97/56321663672.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c90dd746b4c---bozuxazivezujodexuwagov.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/pasigagorukebubov.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/60731770274.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/38503833100.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/15769598866.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/63939516573.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3e691b89a329293d92a20d5d840cf25a/matoz.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/976b06a11b3f1824affd725b70c1921d/96986290877.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210804_4005B00B35F6899B.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ebf25201d---38459512695.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f11292f30---84129413761.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ehfj7lhl6katjtb7cksbttp3pv/89013507427.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/dexetimujasugiwajelixub.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jidugegarafijavijeretesut.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/33b4dff7b9726fae75c4d2cf10ef522c/rigubudu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a272ecd910---49129494107.pdfIn PDF document text
    • https://ocw.tw/uploads/files/jidugaseroziwuwa.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stigmatiser+d%C3%A9finition+pdfPDF 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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 22828 bytes
SHA-256: f3750ba577eafcd6f7a7a2f793f3863de6b57cf45431d272cf334fcc693280a1
font_01_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 11024 bytes
SHA-256: 8c94dcd77965744a64f22678ff4a8356957cdc825eaa3c613de2c09dd531e5dc
font_02_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1