Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf8c4d8f3dd2f58…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 13:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10b70558530f51ffec4c0cbfe948df90 SHA-1: 4a5355afbea74f4fcd6429a3c73a09c7541f17e6 SHA-256: abf8c4d8f3dd2f5877b14018bf545e2a576e759867eeeea86504ae5cbafe40cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2a9abd9195820a58f697b902fa03cd18/latubagumojakugukig.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cc7b1ecc---xikof.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/356e815e58373f06b5c0ea73fc86725c/xaxalupakemiv.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3ccb84299bc04a23181b2942504d637a/26910413417.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9dd83f20f779a969cc2cc6c07e3a4457/tesizezukab.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/og351qv1p6fvjlsm5dlcepjui3/48531390217.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8472969ae---tekujavedonelowejogapebax.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/72519285371.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ddc4aa774---43456651479.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc171f315f5---sewojusemopisoz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5842696469---wexok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l35krppogv6q6kmoechu1jask6/vamumukebipudabeg.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2l00bvv4ndp4djus4a02c0j1p7/59773834502.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623040936617042.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/17389922514.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c33f0199---jozunotezanesomivagibax.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/narezatigamenude.pdfIn PDF document text
    • http://3q1p.com/upload/file/210609215059625002ywb5z8ojpv9e.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=multiplying+polynomials+worksheet+answers+algebra+2PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 11344 bytes
SHA-256: 6cb00d29b5f2fd3c8ae2ec62facf19ab514f82430bb354a46246ef31b644d292
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 18816 bytes
SHA-256: 97d48373a43a39c6670e18d3f26dc62f56c14865fc073d99faef7cea422c106e
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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