Malicious PDF — malware analysis report

Static analysis result for SHA-256 a387849b5e305d6f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 07:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c3355b8bd5fa2a1a65e124025b573ea SHA-1: e96a05216b0a51b2231ddec171fac23850e843bd SHA-256: a387849b5e305d6f92592f9db988261ed26d740f29c9910c10a072355698ed5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442878b398---jupazosirunirejow.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106251749309282.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e251afb866e---gasazavapulesejasogujozu.pdf
    • http://czdashan.cn/uploadfile/file/2021062409465673499.pdf
    • http://abarappresentanze.it/userfiles/files/9190775177.pdf
    • http://fd-health.com/upload/ckeditor/files/pupazafesesez.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/32m2iui4e00djme74fticgsnl7/wetola.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t4l1ourgm5p7noruq74q2d0dj2/wezag.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pmuh57jl8vbqg560ogenr5mv83/13663707409.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f4376f8b---20884547884.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/236971d4f72057020c48b030579a1754/46144893165.pdf
    • https://champion-osk.pl/userfiles/file/67314924634.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/52eb1f4ab7309be11dcc8543c1498f2d/26118582178.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ob1rj41t36fugrfunoesv9jl2q/80463864726.pdf
    • http://mikailang.net/userfiles/file/20210602203456_150632098.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3j1617mhesqshua11gd0tmk3qj/75803320950.pdf
    • https://equator-maritime.com/userfiles/file/64497783596.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1d866626---moxomufovukajexiv.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21745d46fc---pijeti.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3a54c161---76696721566.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62233fd0---xowokitotukuliputun.pdf
    • https://ehlibeytalimleri.com/resimler/files/xikutexaxaluzizakuzamen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+ofc+mean+in+medical+terms
    • 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_off0000ed7b.bin
abc09cea6a11ea4c5d4bf10ac4685de0c08f95f81df635e00f7574c18e1ddac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 17604 bytes
font_01_sfnt_off00011b68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 16792 bytes
font_02_sfnt_off0001337f.bin
318579e13c9dfbd56602acd5bebfad788fe5bde4a4119d90c78391c8e0575bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 10732 bytes