PDF malware analysis — malicious · 5de328e0b14be395

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1d641d38f4cb2cb9666cbca42ccd5ab4 SHA-1: 993606940475d6035fef75382394ed623f0a0644 SHA-256: 5de328e0b14be395bb71cb384401252656ccb9330d90c51ae65bbb315b145750

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=divergente+pdf+1 PDF link annotation
- https://suthuytinh.com/app/webroot/uploads/files/xatiragowifudagoluzibu.pdfIn PDF document text
- http://tomasmrazek.cz/userfiles/file/bawonakizopebepugeduz.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f4ea471abda6e219115e7e45f13053be/76168518599.pdfIn PDF document text
- http://rjt1.org/upload/files/ligukovimamumareso.pdfIn PDF document text
- http://objets.immoweiss.lu/userfiles/files/jizej.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3aff90307790e61ff795563df1cb0eae/33131350547.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/36332523613.pdfIn PDF document text
- https://kovosluzba-praha.cz/res/file/1642549678.pdfIn PDF document text
- https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/pr6rf12bubknngfsaefj783be1/11276086441.pdfIn PDF document text
- http://targdenunti.ro/userfiles/file/soxijuzofaraxifukikot.pdfIn PDF document text
- http://krajinar.cz/soubory/files/pewesenu.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428bc768cb---11128337792.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/gavom.pdfIn PDF document text
- https://distriparkbotlek.nl/userfiles/files/68567688307.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9u6sl0vrqdt1e3e161qbp5d2n1/zesoba.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/20bffff9f6e31d83e60cf9f466904158/wenumafaxelu.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/taxaxiwaxaletuxesesesir.pdfIn PDF document text
- https://inprovitvenezuela.com/ckfinder/userfiles/files/visebatugegupojipanexiw.pdfIn PDF document text
- https://tepihtrava.rs//files/gupon.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q7jaqer291pb2ev2480s5cb1f1/busejemokaxa.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a2b7c873---kufejivipojow.pdfIn PDF document text
- https://hiroyoung.com/data/files/80172828809.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/03074333c0fcbba74783e5d441a6bc2c/katumolefiwirawinanaka.pdfIn PDF document text
- http://www.smartlandgroup.com//ckfinder/userfiles/files/jipinipupezevinawabawipaj.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd0d18e69---75133867581.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092deb67d8c1---wagunidonoseto.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57a2361aee---49149318548.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_off0000e952.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE952	10296 bytes
SHA-256: `d4d54a7546b1e9cf3497221d9e2631f5f3a50501cf935d364dce8ded1be31b10`
`font_01_sfnt_off0001007b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1007B	18316 bytes
SHA-256: `845b3dd926a9e106a0308b8d6f0d03020fb06403b2ce57ef5a88b8289f2c1a7f`
`font_02_sfnt_off00012fb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FB6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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