Malicious PDF — malware analysis report

Static analysis result for SHA-256 734c4cfb670d7cba…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 03:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 50dc7742e8dfc36340d091d8cea7df78 SHA-1: 7c31385458538c289c994f2ac2246221231bac63 SHA-256: 734c4cfb670d7cba44a42ceb61ed526cd6d03dfd314ad136c637a94414e5adaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the presence of multiple external links suggests a redirection to malicious content.

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 https://laborke.ru/uplcv?utm_term=find+the+mean+and+variance+of+poisson+distribution PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ce14548235df4cdb9028065af0c5cb70/87852995296.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/18c2efa72e7a0f6c4d0b04e29d5b47e6/56383035395.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f707a5ea9e---84216369250.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/gosapufusaxil.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9aae80b5f---gozidoji.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/luxagin.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baaf17525c4---82298768169.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b03584732c9---25120588901.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6ec35981e439bee12c6a8b982c375a4d/lifojuvategoletojajesumat.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jsl81moght5eam527ub8kbts2h/940126468.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/13601366777.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e57a0e120---32149691385.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/099becd6ae13c516d9be31d823a8803d/96211395190.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730c29fcf6---misan.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097128ebf6fe---1837707736.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/53949407785.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/daxuf.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/3020174245.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gibiluzibasaxemapawusob.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nfhbk4n1mn1ie0ml4ugklnsmr0/46778658623.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9avmsd4dft7ai7bb0ufq67k6tu/35542075081.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2bcbf4ab---dinabax.pdfIn PDF document text
    • 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_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 18100 bytes
SHA-256: 0a42338c018e5bdfbb6ecc7dee2c6140e2b756291de7a8c5a458b25a4fd2f216
font_01_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 11124 bytes
SHA-256: 67daeed3f6522521aef17467b70192d1b478857e5f162d4ef539df82001a1cfd

Open this report in the interactive analyzer, or submit your own file for analysis.