PDF malware analysis — malicious · ca6ac4bb26900bda

MALICIOUS

PDF

78.0 KB Created: 2021-07-09 17:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 8514fa82dc488b96c7b640c457b549a9 SHA-1: 2a9a5f3736986c9295362e86700439f348433a55 SHA-256: ca6ac4bb26900bda75a369218acbdf95ca3d67edff699492883c46e77ff26e6e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal a link farm structure pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as those hosted on `ketchas.ru` and `scanworld.se`, are likely used to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9829

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://ketchas.ru/uplcv?utm_term=the+wrentham+outlets PDF link annotation
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26b526f5d---gofemitenix.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608023fbe3fbd---guwenuwolefibopanuvex.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d52b8f539---vikalumudi.pdfIn PDF document text
- http://schroniskoorzechowce.pl/ckfinder/userfiles/files/monesumolafexomaresi.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/rideniluvamibivoxevatun.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/7693041750.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/24lii12toucohvktiq9s5rchp9/7343167194.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee74ce572d---maxakenonogelekujuvar.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160886eb57850a---remagosirafin.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608301b88d17f---94921712996.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c437e44aba---57071294430.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/jtrtjih7gukf9gn4021u90vjin/3061593327.pdfIn PDF document text
- http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/83896897692.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2gi02llufm2sb4csbel8i4u7j2/65982208224.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79321cce9---susemoxi.pdfIn PDF document text
- http://rideco.hu/upload/file/17353153059.pdfIn PDF document text
- http://helloshoppingnepal.com/userfiles/file/tozatuzogoduwaj.pdfIn PDF document text
- http://carszana.com/image/upload/File/bilarinodigisimenamexeru.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8494dd108c519eb32771681ec0c161da/fobeno.pdfIn PDF document text
- http://pulsarvn.com/media/ftp/file/95033277057.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfab82555---72017228114.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/768e1027491367e0b38d209dbc39d3ee/52308383386.pdfIn PDF document text
- http://adveotec.com/img/file/dakifirewuzudidiva.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702da027706---verifofitukot.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ut8a5f26sfsfurdsseu88tgohu/8880484824.pdfIn PDF document text
- http://s292376414.onlinehome.fr/datas/imgmail/file/fizisitaletegikap.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_off0000cd52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e564.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE564	17328 bytes
SHA-256: `110153a2edb008b3cff695b0d1a795bf7461806422aa04952fb3c8b3766d6791`
`font_02_sfnt_off00011318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11318	10428 bytes
SHA-256: `2597a1b86b44134a88325ca9a5c15e62731d2cb752c0ad81cb8b2790bc12e861`

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