Malicious PDF — malware analysis report

Static analysis result for SHA-256 342fa675da429f9e…

MALICIOUS

PDF

84.4 KB Created: 2021-08-12 12:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e2d860069e041cff977b9b0343b8758 SHA-1: 7f8486db3518da6abc3f2bcef0bf642f69305cc5 SHA-256: 342fa675da429f9ee274a082cff38f57bb7d273e4707dfc7615a5db0f792c850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. Heuristics indicate it functions as a link farm, potentially for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0a4cce27c---36236427849.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f9f8708e03ed1cf727dd5b84e5de9e06/zodofet.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc2620d25f---tivodifipasevunatezuxi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095312e683a2---pilejivepavawogebomopam.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/69546264515.pdfIn PDF document text
    • http://iltorg.ru/upload/file/woranimofagopuponunifo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d2a4b866d---46246809819.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/85399563541.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077669164485---vepopidexunenetusadejotex.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b3037cbb---97852856747.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/migavexo.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/sabekopijuta.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kixorisupujemuxojagawamad.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097a97c26e1b---33849838029.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/larefugozakajulexevi.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vunijaxelepejuliname.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1be91e82---bopafa.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/2605751188.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f4f49f6662facd67bf9e5b6fe87531ce/7851219424.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/zifowa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1b7b237df9ded10f4571d2f05b6ab188/figuwotaxig.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/zeluxa.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/juwakotara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+write+a+performance+review+commentPDF 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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10924 bytes
SHA-256: 523631c486d8b9535c1de032e4a2a441aca396e8e6bbe15d396b4c9a6b53192f
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 16204 bytes
SHA-256: efbdc24bf4857ac882b2c4a0b591c82bea157a21ab36ee7bc3f7f3e6eeb0e66b

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