PDF malware analysis — malicious · dd146b79434569f4

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 10:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c52fb13bb8d71305a20aba1ffbb52d9a SHA-1: b436f866976e28fd7ead31a66045c0990daaa967 SHA-256: dd146b79434569f453bd865cd7e73e225cbf0c4192eea8e3d80155ab7e726a92

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The embedded URLs suggest a lure to download content, likely leading to further malicious payloads or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=download+gta+vice+city+cheats+app+for+android PDF link annotation
- http://digivideos.net/ckfinder/userfiles/files/nasovinogotufizulotixewa.pdfIn PDF document text
- http://fotografoenricogiampieri.it/userfiles/files/51453519544.pdfIn PDF document text
- http://psycare-spb.com/userfiles/file/lowakemuwaverebukore.pdfIn PDF document text
- http://metalltechnik-kutschi.at/72742931179.pdfIn PDF document text
- https://shidoremicrosys.com/media/mukuxixinadizimira.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8ba25e25ed6c32c0d9b6cffddff40dec/42909553267.pdfIn PDF document text
- http://bassbasement.org/userfiles/file/64057676685.pdfIn PDF document text
- http://gostinica-domodedovo.ru/files/80033523289.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdfIn PDF document text
- http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemerolixovumotuzib.pdfIn PDF document text
- https://ubitanduk.com/contents/files/55968206083.pdfIn PDF document text
- http://upsshop.ru/ckfinder/userfiles/files/5846681696.pdfIn PDF document text
- https://kfk-dekoration.dk/images/uploadedimages/file/13551055000.pdfIn PDF document text
- http://3bbb.fr/ckeditor/upload/files/6113173393.pdfIn PDF document text
- http://askort.pl/Upload/file/4442037664.pdfIn PDF document text
- http://abnig.friendship-match.com/upload/files/65071819259.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161437a5bb6dd2---38515042848.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161347f4d9cf35---larunozibexesawegeka.pdfIn PDF document text
- https://coevent.ru/upload/files/pufofekalovavojevit.pdfIn PDF document text
- http://dfanchem.com/upload/files/31137684133.pdfIn PDF document text
- http://mskgroup-spb.ru/upload/file/96102145695.pdfIn PDF document text
- https://kotata-zlin.cz/obr/clanky/file/73819342529.pdfIn PDF document text
- https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/zigol.pdfIn PDF document text
- http://infoegrafica.com/userfiles/files/97866009590.pdfIn PDF document text
- http://ajeah-intl.org/fck_image/file/74656251135.pdfIn PDF document text
- http://casaperugia.fr/userfiles/file/xupug.pdfIn PDF document text
- https://sukaunited4d.vip/contents/files/96268988873.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_off0000d490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD490	11164 bytes
SHA-256: `25da5008e4a1325c7a5c7b488b77788f8816307a22df1540e9420c5cdab149b7`
`font_01_sfnt_off0000ee79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE79	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001068b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1068B	18048 bytes
SHA-256: `6ab66c631da35c1af740f0908e582c3b4d556b410b7fe917a8b2da07fba87ab1`

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