Malicious PDF — malware analysis report

Static analysis result for SHA-256 440ae2fff7c593a5…

MALICIOUS

PDF

105.4 KB Created: 2021-07-09 01:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d4503bbe70d49a922424fe6dc36bc69 SHA-1: a781463378f182d405b4e886d3501e0a7a1d421a SHA-256: 440ae2fff7c593a5955ba95333f52fadbefbbcc870083eeb98cb61d17bf0264c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or lead users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ajitcoatings.com/uploads/boxufepupiwolu.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2f562d20---motabuwa.pdf
    • https://ikuseikyokai.jp/ckmedia//files/dazazajagobudapomomepan.pdf
    • http://au-coeur-du-temps.com/userfiles/file/zeminugutapofovelesu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eef8baeda---23958021146.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cc44cacca920765c0e280818ed32f029/22607589294.pdf
    • http://vladjurnalist.ru/archive/file/sidepobalepoluniwit.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff17512bf---62794700485.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c12f7fd14---dirovinusaku.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/kosavuwemidosabef.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086901425d27---fosujoter.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/84369375258.pdf
    • http://yaqeen-eg.com/userfiles/file/82177196159.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/tik9clj2idgvmjqf7057heup6e/nulatow.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335a1954ee---1954479390.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/i64tv1p6j4da1j1ivpetisddb4/18346574255.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd8ae4913---kewejatawesijozilavidikot.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4aeb40eb13f1ecf4ba7be5dee4bc191b/67901911623.pdf
    • https://epiphanych.com/images/file/pijowutasufovux.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/783efedcfe9c46efb047774d3696b27a/tisinuzesozikaf.pdf
    • http://residenzaeden-albisola.com/userfiles/files/xenudejuzubanerididibo.pdf
    • http://alfavit.tv/userfiles/file/puvejadepu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f166a5a6d---57758894624.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49e4c14eb---66618217562.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lana+del+rey+you+can+be+the+boss
    • 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_off00013a26.bin
377f4b8323371341c5a6564f3d4e5b4e98d36b5bcb1ca204e4b09fea37fd101b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 10684 bytes
font_01_sfnt_off00015299.bin
2d2fc1735ecec3b1da6689e66414aa55b9fd6a9297d3cd8526b0e6a5efc08888
pdf-font-stream PDF embedded font (sfnt) at offset 0x15299 17328 bytes
font_02_sfnt_off00018023.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18023 16792 bytes