PDF malware analysis — malicious · 58b4eaefe2df7aa9

MALICIOUS

PDF

127.1 KB Created: 2021-06-26 19:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 13cdece9f06c7cac4284033304ad352d SHA-1: 3fa6d9bcec0830fde60272fa521ca608c4dcf4d5 SHA-256: 58b4eaefe2df7aa963765ae3f4fa5b25639da5d9d9ce2bb2211da450ae00d8b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or phish for information. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the file as a distribution point for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/463e87752834cf6de739dcb4d3697ade/94766005892.pdf In PDF document text
- http://vtvxm.vn/userfiles/file/61332330289.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdc80765b---4960018021.pdfIn PDF document text
- https://irantruck.ir/data/file/17047882923.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/37180466fd5e66c48a665f0a3dc4727c/25770883439.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7d6b8f89---28049979884.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af980d568a9---63530414884.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6fdba3e253e0b7e772d9c2bd8f0567f6/83291575694.pdfIn PDF document text
- http://harasim.cz/uploaded/files/88121689224.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/20ca139b2b567de6631b74f6325b8741/7517080055.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/375imib9l7fp1hiocfnsrrre6k/debelu.pdfIn PDF document text
- http://sllight.ru/design/img/upload/file/kedasikerotazajut.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb06c0191b---remawajilexodupi.pdfIn PDF document text
- http://berallebags.com/UploadFiles/FCKeditor/20210516113731.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160accb69184b7---pagab.pdfIn PDF document text
- https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/30ec0069c2e4d432a1fea1d0f00d760c/39307540007.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a69917c745d---88570088792.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700caaaf431---52291301624.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab503a68bdf---48194362626.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ce99607790ac2d8ee8f1fb624f79498/92030183530.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/477a1653355b002c1229f705c7e02d9f/bajixigimilolo.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/wawutadoganogiw.pdfIn PDF document text
- http://udokutscher.de/gfx/userfiles/files/sivixulodepidigasuvuxoxe.pdfIn PDF document text
- https://stef-nancy.fr/upload/document/50518472848.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d5a756101c07d4b680942b277eb9b937/7477995307.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ms+excel+practical+questions+and+answersPDF link annotation
- 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_off00018c9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C9A	10932 bytes
SHA-256: `41dc07a05f99f258596d2d24b5bc157bef2459144c2e15f0a0367eacaf85d906`
`font_01_sfnt_off0001a5ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A5ED	18216 bytes
SHA-256: `f3463c823f888aed17bbc998bf9414017e79842df15ae98629c6c4e3c327e22d`
`font_02_sfnt_off0001d661.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D661	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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