Malicious PDF — malware analysis report

Static analysis result for SHA-256 09df1ab03686ca5a…

MALICIOUS

PDF

113.3 KB Created: 2021-06-25 17:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35f1c0c3ab66a998df85da7b94517fc9 SHA-1: 471ee90da3aa1e5c249628138626f42f3a3e8fea SHA-256: 09df1ab03686ca5a26255a80d9ede8e1701c83b97b4dbe728499d39d31a131de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=xvideos+browser+apk
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d928b624---koguduta.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aq4cdutq2kjol1lqnjd67lgjpu/datis.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ad1b9d59---lopegorizokevisitabi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0331d34ea---25556465703.pdf
    • https://detectiveoffice.net/userfiles/file/24407974920.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/boraborufamamifevati.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a97a41984---biguvakesaxejizigeve.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9402252c4081bd82057fc2ac91aff030/sofiputawamozafepet.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac875d08295---14783791297.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/eknnil1rhrus2o2jdask1h4vk1/nudago.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3a463920a183e41de65d3ad6910479a/viramizowematutunef.pdf
    • https://amitadevnani.com/userfiles/file/delupuderirowafus.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4782da5dc3---jewilajobutovij.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f557ca1615---94011687216.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8a35686560385a07072cb57ee166f44a/joxexasase.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4e4e3937c04bef55b11a1b0e1b4cd5cb/diwumezozusamirideloja.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4362be121---75377370748.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f659d106---72912243893.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81e62f7d2---xerivutabebadonaref.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901e78a123a---bemepudalideferi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012d1c.bin
f644a00d86d9ec9be6f849c4dc13a65354c5cf7b15d82947bedcb4d8d1feadef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D1C 23820 bytes
font_00_sfnt_off000124ed.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 1732 bytes
font_02_sfnt_off000157fb.bin
2df8ab9a1c901e0ac412abb0c12411905668637708a019bbf948913552a12823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157FB 10528 bytes
font_03_sfnt_off00016fe0.bin
26ce5752ab0cdd92ccf84f39e148bd8de112b6de1bb394cd1352eb268e42a93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE0 17900 bytes
font_04_sfnt_off00019f61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F61 16792 bytes

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