Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab08f6f65ed1c1e4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 16:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de907268b788f11c2278db63f6e5a246 SHA-1: 57f8fefa1155097b7acb5cc6afb16d45522248d0 SHA-256: ab08f6f65ed1c1e41367e970e69e96feb84800655e6a85b2d961bb2ed7f74e5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised and disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://5a.ro/ckfinder/userfiles/files/73978859714.pdf In PDF document text
    • http://dooroc.com/tk/upload/file/gemogijipavexag.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/43896695023.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/rixemalufujofazuxunexesa.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/rexuposinufanubujapox.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c264eb34---gitopanubogotaguzukesem.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/63727085908.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/baguneraritijibaxekuzetu.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/68380858379.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/lenurup.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/38248392784.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c861fe24402---37203670190.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a420da8479---47883870863.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/tawuder.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/30325830832.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/kaxowabimitusatake.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/jesujakafaginokafenenevi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/vafafazosotumem.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4f4c5fdede232186099526ee8a4d4539/25859872478.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/visibezerozukug.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/lekezezofafanowadogokaxej.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///20775970649.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0d0307ba13d6d783d389424d53621849/nejipajokav.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/74120226845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+scanned+copy+to+wordPDF 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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 16840 bytes
SHA-256: 8a49a327921cfd445f7ae1a4e9319f6276208b618cdeea51f9c41b99f45bbf3d
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10668 bytes
SHA-256: aee7e7f359461e8df982fdf17440158fe124d691c52c9af9261ebcf0de7e0c6f
font_02_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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