Malicious PDF — malware analysis report

Static analysis result for SHA-256 88244a0f94f5e74e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 10:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d17b5d4eb1a07f10d8f682d8bdaaaf03 SHA-1: 7eb8a73ed2775c17d9e2da448f12b79052cb0dce SHA-256: 88244a0f94f5e74e9a555d2f366d4b10d263b96088be6f4492724e8841dfffdf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=wwe+2k20+download+ppsspp+file+download PDF link annotation
    • http://hotechike.com/files/files/62874386075.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xajikewitiwanujuruze.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/kerixadowerodiximawote.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/lisumuzobuziz.pdfIn PDF document text
    • http://sbkf.org/files/files/52077036713.pdfIn PDF document text
    • https://yifff.se/userfiles/file/84697430327.pdfIn PDF document text
    • https://membermimpi.com/contents/files/72765001829.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6a070152548d5a9352271a0a9f1016d/dilojomupebefujazikepel.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15561853130.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/pisoxofiwurobus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c2d533d9---91638893836.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e4dcec9---batepebagowegi.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/zular.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/51118121688.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1b1cb0826ef7cc9cdc98353a7761a7cb/1492193465.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/rokaxoduvemikoribufufinol.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/48429926577.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/sexokamifitotedajer.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • http://quranday.org/userfiles/file/timaxomuta.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gejuwajevaravilejig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa649584---72048769147.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10704 bytes
SHA-256: f9b814f230d918d9299139e8a79f37e9ccc281443e1edf8cf5937e1255a67bd3
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 17600 bytes
SHA-256: 58ecc1bf2e77caef6adacad13e47c3be5c25026d5f31dd5449137dabd19b8869

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