Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b467e4c7313edf9…

MALICIOUS

PDF

105.4 KB Created: 2021-07-16 07:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d57d9de2ea940e39b3ab768ce7fd0d7b SHA-1: 27f31a4d9d141a6143c7de293ae6e49a40833fb9 SHA-256: 8b467e4c7313edf9e2750ebd0cbd09f97f446f0249b8a15b9d08bf9e1412babc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://redfordunion70.com/clients/869360/File/38361814141.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l63iv30jdai74o96eil2btjdof/51276404507.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160958406060e3---tiwapunovafavuroxonugu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/gofujupi.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/bukebaxijagaj.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/44824060266.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bce2078a---juneganojenixo.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/27776879763.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210703_76C9EBA71A583B48.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d9d9c07e---dupukodoresofoge.pdfIn PDF document text
    • https://wita.lt/images/files/85602019765.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/goruz.pdfIn PDF document text
    • https://led7.ru/file/daxivofexin.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5388d2c563cd26da4f8eec5307212696/xevefepexisasirir.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/wedekiguvebararaxodufuduk.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2dc4136f---zavokodugabovivolife.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/53f01q6ci63u84t6sp39tib111/mukanabexu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42abff793eaa7f3644fcf195c73119cb/42455023832.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/nadegikaxirotibedub.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/milore.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/63aac909c368574d55f2475288497ba0/3907584254.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7262b830---fuvamufimav.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xulotafekesu.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/33167111692.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05835348fa39cdfe3d8e2193d5710ff4/46479460549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+unknown+soldier+1955PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011311.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11311 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10680 bytes
SHA-256: ae533e96d8b2e7bd7620f2ea0aaa91869dc81cb1acd80fb849bf07e2523ecb3e
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14723 28144 bytes
SHA-256: 8b9a560670b1a27f58a0d7c718b38bf25fba3225b2a099a6b675eb096c52252a
font_04_sfnt_off00018bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BAE 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e

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