Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21ace5c7c910713…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 03:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbe0582fe5ba646abd06d95550aff2f1 SHA-1: aaf1fe0ed171951d1c4c3de43ce14346595e1e0e SHA-256: f21ace5c7c9107130f077545a5223d4a1b623aed18682871f52a91efea82cccb
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, characteristic of a link farm used for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://motiwalainstitutes.org/userfiles/file/88713286419.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac973f88655---vorejipokujagokeluxomiret.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d4101643ccdf3afabd750b07efeb657/27708720852.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ac752ebb---83996486255.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/befibopisavixadi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630848549.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/37813767104.pdfIn PDF document text
    • https://esz.jp/img/editor/files/68701361229.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/9938827796.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ropilos.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s3kf7ks6nqlhqhrh8rq88jat6s/35034602854.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/pimotewokodevanilujipefoj.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/sijedogelanisoratutu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bapesib.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/91461889270.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceec4467d2e---29737965347.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/2350191364.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609853fe5def9---91785349269.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/tediremupo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13434792c---govimim.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/1jg7njl1tsc7cv5lgmdvsrqfa5/43991591028.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/537f002418455d279ed139cdfc9a5b0d/24790640008.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/98120899647.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/15lu8gtepcd3c0saneujhjbpa2/lagubageburaliwodafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=convert+excel+spreadsheet+to+pdf+on+macPDF 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 10992 bytes
SHA-256: 1a73ce094b75d7e5df3e211844c42f8111f034a01f516e46b3d230d86c156e91
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 17508 bytes
SHA-256: 470be9b6cff045281f2728ed6fdb38f487b74f7667f3e4f1de0417ad62418fde