Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0f25840679d326…

MALICIOUS

PDF

110.6 KB Created: 2021-07-22 23:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c3dddc277f2e681a8b4a269cdabe2cb SHA-1: 0cb4ea4645fceb6065e84d0d05fec927ec10ce49 SHA-256: 3f0f25840679d326d4ffe80ddf71f4bf4351b1496165e0e180280831aeae183b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is used to host numerous links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://freehajjandumrah.com/admin/admin/uploadfiles/file/78998710997.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5kgbl7g8v8b1thvjjkvbguv016/vesejukani.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/75506718433.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9f19e31332762dfcc06f7280e1203c1b/samisuxolilopidabok.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89c7cc590---lutasubaxijidoxonamawar.pdf
    • http://rts-3.ru/upload/files/26020009886.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddba4c6c5---35021699011.pdf
    • http://asiadomainstore.com/userfiles/file/10645484759.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ffdae811---26590369524.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f308153529d0e54eacf74690534edc16/xiganabilezisulopezera.pdf
    • https://chupwo.com/editor_upload/file/nojidonezimowaluvori.pdf
    • http://goteneplast.se/files/images/file/77328643793.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdf
    • https://inijariku.com/ckfinder/userfiles/files/wamosamagov.pdf
    • http://superfishinglewood.com/uploads/files/73655548068.pdf
    • http://areaengineeringsrl.eu/userfiles/files/47238985515.pdf
    • http://allasclub.com/campannas/file/93607767729.pdf
    • http://93564497.com/userfiles/vuvug.pdf
    • https://machnhaduong.com/images/uploads/files/wamuweba.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa6168406---dadexozenaridunixilofuki.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/6104906851.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i7o6aaf9g30v5ujjs0uo9kb1g9/vujivefabimonumobizoga.pdf
    • http://showplus.ae/userfiles/files/lurinekapatojogamufaxanul.pdf
    • http://jar-ted.pl/file/gepozifosafejaveb.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4abe8287---75690200746.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/385015c932b042764e54c67788643f7f/madaxofovaguwab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+an+absolute+ruler+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c20.bin
b378258cd01af945163be1899fe2de30424475ac3d35d295b55c1638e810cbaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C20 18512 bytes
font_01_sfnt_off00017c25.bin
69d1d4dd0738a640f0a04cdca8e6afb80195a47ef78d4a9ebe7dda2c11e42e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C25 10700 bytes
font_02_sfnt_off000194a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x194A6 16792 bytes