PDF malware analysis — malicious · 93e6ecf3bb49dd5c

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 16:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 99e8cd3a4015cc5b05fb9c7c1303357f SHA-1: 4fbf6a334ce96da58248480ae4b9285642b3d202 SHA-256: 93e6ecf3bb49dd5c1954f79de19058bff11c57a3d1074f4d264c42af3d3fd7e4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into clicking these links, likely for financial scams or to download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://synerhu.ru/uplcv?utm_term=price+quotation+sample+letter+pdf PDF link annotation
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c769bf20---zapupunaz.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb7cd5e36e---97324764401.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e9a98499b9ddbf0137dab7b9796b5698/xajifedezajuxiv.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c88df442---55577665786.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/887d8af95a4d99ee57a981dae8f9de58/vibojosa.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/37747204563.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7432f521a4---82412425743.pdfIn PDF document text
- http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/74998309709.pdfIn PDF document text
- http://aryajob.com/user_upload/file/44253633343.pdfIn PDF document text
- https://bselink.com/userfiles/file/30335176268.pdfIn PDF document text
- https://designclarf.it/file/36377791912.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5335303aa1---zutewenedugapalaluwefatag.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aa10ab734e6dac356c41b41ec3fc4853/25115547659.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e4553b8b---46701559164.pdfIn PDF document text
- https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/55e5e7d81e28e6c182cb70783c07cff5/9671252620.pdfIn PDF document text
- https://biovuspharma.net/userfiles/files/kotapazamod.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843ecd8c709---48908313188.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b39b87d75---tivosiw.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ca8a170---wevixokijaramafe.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079543ca9a99---9757810508.pdfIn PDF document text
- http://folientastaturen.pl/_data/file/4462479696.pdfIn PDF document text
- http://cs-golfclub.com/ckupload/files/11798178329.pdfIn PDF document text
- http://kehlux.lu/userfiles/files/43388626982.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe197c07a---69722788129.pdfIn PDF document text
- http://espokebar.com/uploads/files/fegezizo.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076665a4cec4---figuvapunigoza.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_off0000dc0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC0C	11028 bytes
SHA-256: `4fa991cd76fa5bed9f0b240a2177fdd0806e16584f31ed137b79b7de6eb6b801`
`font_01_sfnt_off0000f574.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF574	17324 bytes
SHA-256: `5a09c166d0850503837fa5f9492be4dbc31618393d8ab9ac8e28882cef1cf825`
`font_02_sfnt_off00012258.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12258	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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