PDF malware analysis — malicious · 9c834729de24e4c7

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 21:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: cc946c788cc9b898455bcc99c9425bda SHA-1: c2dec99ac821d7d5196fc8bf97b51d6b6882ad6a SHA-256: 9c834729de24e4c74870802479071e152d3b5dbf9e77dddfa35a03209d45f578

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, indicating it's not a typical user-facing document but rather a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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://kossuthdigisuli.hu/userfiles/file/falorubuwiwuzikup.pdf In PDF document text
- http://findusafranchise.com/files/files/46441167880.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/463697537043ca49be608546bd1e32b7/reworudagavotinoti.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9192802cc---gepuxajuvapodojomi.pdfIn PDF document text
- https://firmabudowlanawalczak.pl/web/uploads/files/58359838145.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/46170c1e4cb86a8e4825cad813943cdb/salovurenadimuxerijaveka.pdfIn PDF document text
- http://orderkai.com/uploads/files/liwugojadir.pdfIn PDF document text
- http://freehajjandumrah.com/admin/admin/uploadfiles/file/satavawu.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0cc2492f---ralutosotodejaf.pdfIn PDF document text
- https://futurefacesnyc.com/uploads/file/fipibikuzelojid.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27dedc6a4---tolumobuveniko.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1106801ac5---lumotako.pdfIn PDF document text
- https://www.serwkom.pl/plugins/ckfinder/userfiles/files/9748920551.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/80ucfobigitovf0trao7hfembj/tikazafumalabofopusuponuz.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k90mov3o26d6v6urbgnfq83hu1/13458145109.pdfIn PDF document text
- http://stepasidemedical.ie/images/uploads/file/gotozesowuxozufokafu.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc11a88a1---noxumogin.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd7d0de63---jufonavepipikef.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa19594a40---72663566206.pdfIn PDF document text
- http://arebiatours.com/uploads/files/bakenemef.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608446e43f7ee---16520557197.pdfIn PDF document text
- http://donauwell.at/userfiles/file/79712989334.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/726addb5e66446177d5c5feb46a0dab5/27654142059.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/44134304990.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7e264f1f0ad2a8f264ed1d6468eea143/vanixuwejawijumejitul.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fisiopatologia+de+la+fibrilaci%C3%B3n+auricular+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000decc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDECC	11152 bytes
SHA-256: `525137ae91443329ac5ade6c1c579f691b02c23d0eeb642a53db396ddd2aff4d`
`font_01_sfnt_off0000f852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF852	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011064.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11064	19056 bytes
SHA-256: `466c1fd3063af80688f0511a855879312f941db3e5eb2d7a751c506f88406512`

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