PDF malware analysis — malicious · cf44b1abd0ac2842

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 05:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 0b11175a92a4dad510b06388bce78979 SHA-1: a0c0deedb3871315496d3788b712e28dded10213 SHA-256: cf44b1abd0ac284200a0372633b2327aaa1bd97384a481062ad8fbf8065d7fc4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The authoring application 'wkhtmltopdf' and the presence of PDF-specific heuristics further support its nature as a crafted document for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=head+first+c%23+wpf+pdf PDF link annotation
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a95758c05019fea688c9bc4649b87e5/baribokatubekopufu.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610904e83e727---jubixemojegemikamojan.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d1394ffcb3b617aa9e6a43787bbc2740/4872792582.pdfIn PDF document text
- http://www.mbk-montage.nl/ckfinder/userfiles/files/57671657399.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/file/rakerokimokopilipusanaze.pdfIn PDF document text
- http://rubivina.com/Images_upload/files/66352038814.pdfIn PDF document text
- http://gitishahjahanpur.org/ckfinder/userfiles/files/78571154151.pdfIn PDF document text
- http://zjhywt.com/images/upload/File/jexadofizevadewisojopi.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6da65b09e9169a4bccab96f7b3b50736/96563719701.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/76545804814.pdfIn PDF document text
- http://hugslock.com/app/webroot/img/files/durenalipimevuzelasope.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fe87e0448---wanugagexifagunowaw.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d3179d57---89811581188.pdfIn PDF document text
- http://rubivina.com/Images_upload/files/97496025223.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160986872e4993---71657700356.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7acbc25bff81d821830878fb12230fc7/vasen.pdfIn PDF document text
- http://angelcabrera.com/FCKfiles/file/91813698017.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2f26a03fcd7668a5b7e6cc453a85a0c1/46075537889.pdfIn PDF document text
- http://landroverbh.com/ckfinder/userfiles/files/bimotazebomebidotarulinax.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611c08a6ccdd8---5393477551.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607232ad79287---barifapumamomaselokela.pdfIn PDF document text
- https://rhuyscampingcar.fr/images/files/74582476177.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210902180204_fxa8ob.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160976c12ee398---78630100843.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e18058798fdf9bfa959453950788f78/85699220935.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBC8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3DA	17008 bytes
SHA-256: `e6c6eae5ac1b4062140260a3ea96f95ca8184a3af89712961c570790ea939dca`
`font_02_sfnt_off00011ff1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FF1	10192 bytes
SHA-256: `93e92e36f243b713fea43bac4d60bf1c7b76392b7609bd9c491df15cfd23218b`

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