Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32bdb3f4b63fb5…

MALICIOUS

PDF

94.6 KB Created: 2021-06-30 20:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e251ad51cafec89003429419f59bdb4 SHA-1: 68c71560e5eeb4b1665a548e27392556c5adc760 SHA-256: ed32bdb3f4b63fb56c6e1cc241ba2cf945e7eab61bcce564ca3952c82c2fc372
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on potentially disposable or compromised hosting suggests an attempt to obscure the ultimate destination or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/v50ffp8urfd5fqlt9itlapr9sl/sivabisasejugagepo.pdf
    • http://teraval.cz/res/file/17261653067.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995ca1bb63---36995780170.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b0371e2ea92925bf37723c27af0efda1/90660484474.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ce517e253c62888e8118d9f9c118735/95835663691.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/89081cdd4eab4e4cbe10caa319e2680e/32048888082.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c7ebc38e---18044541418.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/46836710e804e2f53bc114037b35025c/12865400817.pdf
    • http://klpa.net/userData/board/file/bedasifabofozezifevoma.pdf
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/1399455738.pdf
    • http://angelescare.com/userfiles/file/81916729254.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e7761c93---vuwuvurikeveveximop.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b2158d41---pititakumi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b07e728fb000873647ce20f30d50082e/mamujivazovibapawasajub.pdf
    • http://smn68.com/clients/75339/File/52126001993.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ae4cbc4c---sisufifo.pdf
    • http://artgraf24.pl/userfiles/file/zitetolip.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/c281a732119a6319edb0a475fad31359/60314444338.pdf
    • http://gelikonline.ru/content/Files/jifuzanokukarokok.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3d49187052414ad7b240692cb90b8a95/nebixuganavus.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e144d651e1---zaforirosuwuxal.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31660cc81cbf8f90f2f498e1383c6c90/vulimidilubazowavegefulu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da718fd5404---46258366357.pdf
    • http://caratow.nl/userfiles/file/27322202879.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeaa580c1---gozezet.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/55f12bb3c8e9da815494a3677e82ea41/24955314555.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=examples+of+priorities+at+work
    • 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_off0001110a.bin
4b10c693a7d3f4fdd668ab9168198fb674797fb9dc95ea616b8cd2d41d02db6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 16652 bytes
font_01_sfnt_off00013c40.bin
a11937ccc3631259772cbc239a80165a2a2685f290b34c5a05113c750c593003
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 10676 bytes
font_02_sfnt_off000154d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154D2 16792 bytes