PDF malware analysis — malicious · 43537de705451a3b

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 04:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b0482b98aa3e21bc33abdc84641724dd SHA-1: cde1fb71c68388dcf660a865a88d273ea76e386f SHA-256: 43537de705451a3b91efb188461eeb01437773bd7c36f7a1be27e903143e263c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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 external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://allytemp.ru/uplcv?utm_term=hipertension+arterial+infantil+pdf PDF link annotation
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a06978843f5454b09095cc92d3e51edb/kolazej.pdfIn PDF document text
- http://hoacanh.net/luutru/files/83135922202.pdfIn PDF document text
- http://leasingtowers.com/ckfinder/userfiles/files/90518534884.pdfIn PDF document text
- http://fvv-hohenfelde.de/sites/default/files/files/32834568935.pdfIn PDF document text
- http://ornito-silesia.eu/userfiles/file/27954949009.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161313f4d01124---xugilujajexikadixur.pdfIn PDF document text
- http://cutskytools.com/d/files/tizepumowoju.pdfIn PDF document text
- https://handinhand-daycare.com/ckfinder/userfiles/files/nusatasijibeserilogideda.pdfIn PDF document text
- http://levakov132.ru/userfiles/file/96331489189.pdfIn PDF document text
- https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ab2f5e2d67c8c193db9a5327c500f01c/kewokajed.pdfIn PDF document text
- http://modero.vn/upload/files/14699304228.pdfIn PDF document text
- http://cnmrobotics.com/files/files/67847313975.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d1b367e4fd7983862afa73a463f7959c/juregi.pdfIn PDF document text
- https://watosaphotography.com/app/webroot/userfiles/files/20210718_211146.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/zujifodaratonazufaxafuj.pdfIn PDF document text
- https://hogies.com/includes/template/uploads/file/fiwojikafuki.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adc15b2a38---33748600418.pdfIn PDF document text
- http://teplospectr.ru/images/files/dakas.pdfIn PDF document text
- http://personnelstrategies.net/userfiles/file/zavebikigujedipananafuj.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/88470371817.pdfIn PDF document text
- http://chickendaylacrescenta.com/uploads/files/30986029683.pdfIn PDF document text
- https://domilot.com/uploader/files/22023224572.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/lojaxifufegoli.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/96536563279.pdfIn PDF document text
- https://cornerstonelaw.eu/userfiles//file/wexetezuvadoluduvudufo.pdfIn PDF document text
- http://townofwinslowin.com/flash/townofwinslowin.com/file/xelopupikakopa.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_off0000ccb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCB5	10480 bytes
SHA-256: `facb7b362d28f92e47a4955425d657fcfc454306b9656af3e6079986dbea6551`
`font_01_sfnt_off0000e495.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE495	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fca7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA7	16248 bytes
SHA-256: `ced76dd0f038bc0216501ca69b92f8c6e09d57a306013c03f55ae5934ecac1a7`

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