Malicious PDF — malware analysis report

Static analysis result for SHA-256 736954e4613dde12…

MALICIOUS

PDF

97.6 KB Created: 2021-06-27 18:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e1cfd7e84e9af129790e666ec0767e SHA-1: 1ea411a9be86746131ea7c60ce9826b15a2ab8d4 SHA-256: 736954e4613dde123733fbc04372dc97dd55c4591c128dca326b1bdeb39b42f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing numerous links to compromised websites and disposable hosting, likely to lure users to phishing sites or download further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to facilitate the delivery of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=revocable+living+trust+requirements
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf69adb12---36256236651.pdf
    • https://fultoys.com/userfiles/21714718619.pdf
    • http://hrudolf.com/userfiles/46528169651.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792da024dfc---67080803437.pdf
    • http://lubrifianti-auto.ro/files/file/lasaxataz.pdf
    • http://altelaw.com/uploads/image/file/68272774268.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/81603720654.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-24/20210624005848210308.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4bb8c141eaf4ea4bd3ee14cf8c39a115/63785765661.pdf
    • http://ingpiazza.eu/userfiles/files/83211628029.pdf
    • http://ekolojikweb.net/upld/userfiles/file/92539609636.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/60099239589.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/kepasubifegepudopof.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/tumuxogepejo.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6eb1846768c1f0af1a291c316f6d8c6e/36280409694.pdf
    • http://cuatro-pr.org/sites/default/files/file/topudukimatorinot.pdf
    • http://toyteepee.com/uploadfiles/file/210612211609384574y5vz2s.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bab7d283---21591018667.pdf
    • https://jotekonybakterium.hu/userfiles/files/2716354065.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b0f48af553d7dc9d90782b4e0dea7058/98618954594.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4aedc8fa---givadenofanul.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872070efcf3---22015216774.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a7134030c090d0002e90c2170a9c8/vaxanokawirakenekise.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://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_off00011a11.bin
c54cd21478b05d1910926492f4b569d4ec8195ff284f8c0e6ea5e3dfcd3649c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 11068 bytes
font_01_sfnt_off00013395.bin
a7092a36e3939970271be60e7908268efadf6425f0916ee7bb217b9443fdc034
pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 17404 bytes
font_02_sfnt_off00016113.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16113 16792 bytes