PDF malware analysis — malicious · 7c2c203b42293d2f

MALICIOUS

PDF

92.1 KB Created: 2021-09-15 21:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f348f624f905f35089ae5fd1fd1bd692 SHA-1: 5112ef9ffe058c5dae4cbf2225312d942cc22c0e SHA-256: 7c2c203b42293d2f7f5ee66f485830bdd053ae598507efe31073ff9b6a343b3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as 'Pdf.Phishing.Trojan'. Heuristics indicate the PDF functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be disposable hosting or compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests a phishing or tracking intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://chcial.ru/uplcv?utm_term=retrieve+deleted+images+android PDF link annotation
- http://ingatlantv.tv/userfiles/files/5221388803.pdfIn PDF document text
- http://rideabikenews.com/user_img/files/lizukalitonejexo.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/51610060894.pdfIn PDF document text
- https://www.bevillelecomte.ovh/ckfinder/userfiles/files/74705566442.pdfIn PDF document text
- https://eletmodguru.hu/files/files/8737049778.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/wapabasijemu.pdfIn PDF document text
- https://totalsewa.com/userfiles/file/muxovibenebepowewe.pdfIn PDF document text
- https://editions-tlp.fr/ckfinder/userfiles/files/16496476489.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131dda34a7c1---56835665190.pdfIn PDF document text
- http://hgbs.de/userfiles/file/nefewapo.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139427a6b668---49044428587.pdfIn PDF document text
- http://aktifbant.com/resimler/files/85629024693.pdfIn PDF document text
- http://proleague.dk/userfiles/file/39449659598.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/lozurapinafikomemoki.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138deae812---85788270385.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141189f8dd46---vogekuzad.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614091635295a---zutipizexob.pdfIn PDF document text
- https://mclandpin.com/calisma2/files/uploads/luwakefisod.pdfIn PDF document text
- http://gatewayhotelbangkok.com/upfile_hotel/files/nawaxebipipiboponadosuno.pdfIn PDF document text
- http://interroadholland.nl/userfiles/file/66310981123.pdfIn PDF document text
- http://realestatespoznan.com/uploads/65549960659.pdfIn PDF document text
- https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/28403573742.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/2829068302.pdfIn PDF document text
- http://countryclaim.cz/userfiles/file/dabanotopidi.pdfIn PDF document text
- https://detskeihriska.eu/ckfinder/userfiles/files/lulasetibawijirizewufilo.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_off0001022e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1022E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011a40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A40	18516 bytes
SHA-256: `349499a66b6823b3049dbdcf50ecd350e72c6f5669be0d038e4da2b0b7976be5`
`font_02_sfnt_off00014a4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14A4E	10704 bytes
SHA-256: `69791ed5078efd81ee3d228bc0788ddb6ad0b7943f28093c94d1542d2b67f281`

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