PDF malware analysis — malicious · c85e1d62d4208b2d

MALICIOUS

PDF

77.6 KB Created: 2021-07-19 23:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 55eec129450cc2740c49c427aec62c49 SHA-1: b89b0dba5957324735654da11073842ce002b677 SHA-256: c85e1d62d4208b2d40d832292def90a0a48bb289befdc6c94219ee08abaf0910

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b479b823---72648658498.pdf In PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qmj676sg717iaandqt3sk4eeqk/13520183577.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2d3aefe03afaf3b2d6a672c95871a857/41531502280.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/delulito.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/045869a5428a0f12687dcb749b90625e/33337993946.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/58adolafd7lo07ko46ufa5uvg0/2954250833.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05850973eab460ac752bd8a6e7677f12/jojunimivawuken.pdfIn PDF document text
- http://barksdalereunions.com/clients/869108/File/2424013343.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/99668574062.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/35898004088.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb399ac1988f7ee338cba9822dafe834/satumotapo.pdfIn PDF document text
- http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/11159709086.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c92f2786---pofukeger.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d614b66540d40e17f030ea11003d94aa/25914622848.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92f61814a---88599414161.pdfIn PDF document text
- http://campfirewtx.org/userfiles/file/difazitavuvimilililaxak.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160835dcf433d7---46016190318.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jr1vi6t2dsjjnuc8n6a6io0skf/7101692388.pdfIn PDF document text
- https://zionapostolicministries.org/uploads/file/nezuwisunusuzurerelufuj.pdfIn PDF document text
- http://mamnonlittlesun.com/upload/files/64321740938.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79aefee6f7---zimabosagapigelun.pdfIn PDF document text
- https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/791d86c94c5eb73affa43953ebfb0654/67370581090.pdfIn PDF document text
- http://goraku-sangyo.com/userfiles/file/11043992297.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a984a22fc---xutosodotizawatiki.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed63683c6---43952438895.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9821fd076c---30900129841.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b14f7d9---petabifawebis.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dave+matthews+band+cry+freedomPDF 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_off0000cff1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFF1	15504 bytes
SHA-256: `e53c97260e4b25e89c06b0c214ac04240d26ae9ed271125522938b0abcd41796`
`font_01_sfnt_off0000f770.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF770	11008 bytes
SHA-256: `09bb1cede4b772afa7147be51a24afde0f0c82cd20304d8583bc73ed71f182a7`
`font_02_sfnt_off000110f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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