Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1f72c6d02f9ec0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-19 13:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf548753c4c0bafe44ad11a3b732aac9 SHA-1: c33e339b8428480dba448b74f4396ea216e214a4 SHA-256: 4d1f72c6d02f9ec0f32768aa6a65f5a01bfe4d73d56cff614208cf93b4ef014c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to PDF files hosted on compromised WordPress sites. This suggests the document is being used as a link farm, likely for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://samudra99.com/contents//files/gozesim.pdf
    • http://www.gesas.it/media/mailinglist/file/wogoferanowigasula.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962d68baa90---63145569389.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7fcc4d5a---fijasodobafeguj.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a60fb02---sidarobabopafibabezutamop.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842293a6c3e---kubefuw.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/surujegibev.pdf
    • http://cartonwrappingmachine.com/userfiles/file/vorujubolukopitavenowumav.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0eb6a36985c9cd0742cc60e057a05acd/1060730064.pdf
    • http://champaigncursillo.com/userfiles/file/42292737189.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ab45e0f2e076d0cbda050d52134c2bf2/wosokukerifewotabodunukag.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tncm538auil53n3ft70tqqkb1v/85845541557.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/243cc3580db586a9566acd6b6daa99c9/18589393669.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2l037rt98ovb5oqb7go92u9pfp/84163531010.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d20881c4d---gepeweriwejifudizisikif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+forbidden+kiss+book+joyal+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee9.bin
b7ab6d9d0e5873f2800ad3e589b2e5f3735347a2097625059118a78f183740ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 7548 bytes
font_01_sfnt_off000117e2.bin
d030ac20599f49b99842b13801be8894bd8fbb6f451ce61d4f988ec68e87fbbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 5460 bytes
font_02_sfnt_off00012a75.bin
dab333a074398e0606b5ada84db6222e94caed0b2e77b55e1621ffd3de774c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 11020 bytes

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