Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5263ee785a1ac4e…

MALICIOUS

PDF

97.0 KB Created: 2021-09-03 21:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c106b5d3f17b9fd0b25f25e38a774c63 SHA-1: 29ea0474beac507c47a1db4b78e16cdecc959cb4 SHA-256: c5263ee785a1ac4e2b1ba0bb7310c94e676eb1470cdd358d7b9e036ac94e3682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or scam document. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or deceptive content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://chcial.ru/uplcv?utm_term=makalah+pancasila+sebagai+ideologi+terbuka+pdf PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f55307e9e---vorolu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/xalixagezagemanekorowe.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a59330ffc8cad0202269fa970cec8a1d/90486141770.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd49fd4363---gapofivoluxelanojirik.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/zuraletapozaw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/62301693425.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/95438961973.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2a1350ba---86289348605.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/62081695740.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca4a07421---gejotij.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/jabujowapagibewimi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d9f6ba1de6d9eb590b3bcab23a2c429d/velituz.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/nnbi48tpk0bchtqo1flcm6jr0b/tazagavumonuvuba.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210901_FE6846A405C167BB.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e3dbc34452b---solevi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/52655867286.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/28989678598.pdfIn PDF document text
    • http://klpa.net/userData/board/file/43591292336.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/1229800552.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kivajogivesajajazoluwubuj.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/21596653127.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac59a7788---suzodujomasavetegonij.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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 17432 bytes
SHA-256: 6c19a3b495327c78d9e80cc60b9cb3f48098cf733c15267ccae02dbb16631718
font_02_sfnt_off00015c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C58 11224 bytes
SHA-256: 9d0789f330ba3b4dacede3d937d2f65dba91d458f8f75ff090b55f81b9f70657

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