PDF malware analysis — malicious · 6fda89bc4c0eb06b

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 21:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4604021b7d3431c228c8d1301838cb35 SHA-1: 12c6758273bb165eb1d6d94072d4443b775a8935 SHA-256: 6fda89bc4c0eb06b152bcc236ead70faefaa303e2f9066521ba8aa938f8da114

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 URLs pointing to compromised WordPress sites and disposable hosting, likely to host phishing pages or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=does+sugar+solution+conduct+electricity PDF link annotation
- http://architettoseneca.com/userfiles/files/66748887729.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/85mt4158878tob3rg7242e0lnf/35344856142.pdfIn PDF document text
- http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/32093489013.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc44841226---50239067094.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/41168256792.pdfIn PDF document text
- http://amsasecretariat.fr/userfiles/file/42447701667.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fuzirurikozujimeg.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609463d6a53cc---54277849102.pdfIn PDF document text
- http://aweibel.com/Photo/file/2913878360.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e29fd27b9---14993427386.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/016fd5337993f61728e789537170b6d9/55452945797.pdfIn PDF document text
- http://tatugigo.com/ckfinder/userfiles/files/29345965985.pdfIn PDF document text
- http://vimbark.sk/editor_uploads/files/65433050846.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b15e3fbe7bb35b57e9f100d9519df829/41172180261.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b2cf8dc190---6409202160.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/620jme3aanuaab2im8ldaehdv9/40208273576.pdfIn PDF document text
- https://pima-alarms.net/slicice/file/dutodalisejos.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc981836ed---8752519406.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7n9pbcb1ocgc82u9nndnlg4a64/tanojujakexemiso.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4f7d8101---86307289339.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4sr5lalb1ojvrj1bi0mdf0bdal/55983646628.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e6cb967---99073329516.pdfIn PDF document text
- http://jyjwqj.com/uploadfile/file///2021062807455463.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_off0000ee14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE14	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001062b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1062B	10760 bytes
SHA-256: `bdf3d98a12c2eab0b2e2b5adcfc78758dacd167bbfed71c866eb72e1a113200a`
`font_02_sfnt_off00011ed8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ED8	17596 bytes
SHA-256: `833d0abb6227f5fa6c7c767d54fe27366b8a9ddfc511b4fb141052d54b750165`

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