PDF malware analysis — malicious · 874533a1ca23b795

MALICIOUS

PDF

69.7 KB Created: 2021-09-23 08:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 4e5fe31c3100b37bd7695725d0b1fd21 SHA-1: c9ccf8acd986b77b9c314200f0ba739fa0f37741 SHA-256: 874533a1ca23b795685fdd048a053d0777eb802defb54c0867d1245ffea27f0f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect the user to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b2c91dd---93265125049.pdf In PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7de5c854c2163efd25dcb0e56a726993/zivofererekuninelugutufow.pdfIn PDF document text
- http://gaongonmaiphuong.vn/webroot/img/files/pagulemajafisiwexajaj.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/45805049234.pdfIn PDF document text
- http://poorclarescork.ie/images/40288769250.pdfIn PDF document text
- http://qapoll.com/2015/vat/upload/files/riluna.pdfIn PDF document text
- http://ottuk-e.org/userData/board/file/9386798824.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/69806621163.pdfIn PDF document text
- http://sanzmendia.com/userfiles/files/sodeluzevi.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8b7d66c2adf6ccf8d775b994a30b1896/natenomuvepofar.pdfIn PDF document text
- https://epiphanych.com/images/file/80116724490.pdfIn PDF document text
- http://yonezawanet.jp/units/24250/zcycom/files/xogililobesijafidukivudil.pdfIn PDF document text
- http://maasmartcity.com/userfiles/file/nijaronokixofomamitu.pdfIn PDF document text
- https://maftplayer.net/calisma2/files/uploads/1736838104.pdfIn PDF document text
- https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/somajerawupevupelanak.pdfIn PDF document text
- http://polimak.pl/userfiles/file/mukezesikegobazaz.pdfIn PDF document text
- http://cachnhietcacham.vn/Images_upload/files/4913834515.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/famixatomojanabob.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ul38shfn1guaojvru34p87ovs7/doxaninirivepiwilobune.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dc58a1db72eeae5614cc7c558ca56081/pivekit.pdfIn PDF document text
- https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/nefilewuxigejanupebonigod.pdfIn PDF document text
- https://wendi101.com/userfiles/file/67077554873.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dddc59061---kepigisozuxita.pdfIn PDF document text
- http://pure-chiral.com/upload/files/60213739856.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+velocity+hackPDF 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_off0000b22b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB22B	15564 bytes
SHA-256: `d65a016ffe482a90fe81c23fb1a0e4a937a24915d06ad75886cc753578bf3b35`
`font_01_sfnt_off0000d9c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9C0	10528 bytes
SHA-256: `d94bdb34dec03510070f45d6b88af8b175f285ee72ce12e6cd89b24f93429f6d`
`font_02_sfnt_off0000f1b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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