PDF malware analysis — malicious · a1b86d1147cd2380

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 01:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dc2ec85e23dba554f1eec39ccd2dc2da SHA-1: 9bcf93df950f4fa33f6de70cb2773466c8276d01 SHA-256: a1b86d1147cd238081906d46d6419c938b8799cc36ca454573869f60178135c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting its role as a content aggregator for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=calculating+percent+yield+pdf PDF link annotation
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/979499be798bb598a2307ddd6f1d439d/lufud.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/pusaxuke.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bvjfso8kf18vqo2564bgmnaee7/zuluxusu.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbfdc1599---9681391360.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a8052d8a9d5---ramepinunigozosezepo.pdfIn PDF document text
- https://led7.ru/file/fasumisinirep.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/zumoteguvux.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad3d9f7d8---kijosuji.pdfIn PDF document text
- https://gamasteel.net/userfiles/file/47229129313.pdfIn PDF document text
- https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/69442540209.pdfIn PDF document text
- http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210830030738.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6ca0db19---repowape.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o8v4u14km9jfnbu3bel9jl7826/desusodapulo.pdfIn PDF document text
- http://elfuklid.cz/foto/Image/file/xoxokavoxejadapil.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jm9e7bfluvp253mqnqp15c3mtb/74811890870.pdfIn PDF document text
- http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cc58a0182e2789e00a9b7da27097f8d9/1682461524.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607338142cd19---95987393147.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/af954ecf55a78f70987304aa88f158c0/dunegifanaleden.pdfIn PDF document text
- http://veivel.com/userfiles/file/gutivesikiwivux.pdfIn PDF document text
- http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/tebibokumumukuropu.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41c22e74e2---laxasenenenegalowugefesu.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e51ea8e7bbee16eb16badec23412cd46/69557990517.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cc19698e1cf47d1bde4de37dec3768c9/subekabilun.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.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_off0000bfc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFC4	10752 bytes
SHA-256: `af75412e1daf8534f0a66025f0d0df1b67170e96c67a49cfa58bbd9db9d5cc38`
`font_01_sfnt_off0000d872.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD872	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f084.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF084	17832 bytes
SHA-256: `83c046a998de18aa01e11953f86db12ae5637d404ada3a268ee34cdd9cd7ba95`

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