PDF malware analysis — malicious · 550d04dd305d6582

MALICIOUS

PDF

90.1 KB Created: 2021-08-03 07:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 72c6653890668ce2be0c50042d164395 SHA-1: 13a7e10e46b08cc82d3f6cc31d6703841f443d78 SHA-256: 550d04dd305d6582d2f43666550f3775629260e82c6290e3f4ff2eb76c44f01b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://garglob.ru/uplcv?utm_term=how+to+ease+a+back+muscle+spasm PDF link annotation
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0359bab318563f003255223ace3f5bf2/98652110562.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bt9nrn78vt3ttt88vodvdkdl5h/1864966389.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200105335d---feveju.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3ukv5ka0fd8v6ndc5tu0l2vqo5/rukajevumufepu.pdfIn PDF document text
- https://tese.in/ckfinder/userfiles/files/37432224535.pdfIn PDF document text
- https://novzelandiya.ru/ckfinder/userfiles/files/17250250983.pdfIn PDF document text
- http://ouhkpthaa.org/userfiles/74653207309.pdfIn PDF document text
- http://prime42.ru/userfiles/files/86585964493.pdfIn PDF document text
- http://wijnhuis-vaessen.nl/site/data/ws/files/vasuvus.pdfIn PDF document text
- https://mimpiindah1.com/contents//files/vaxadutivajugim.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/sof7u1cmn67aqrn4gitjtcg7l3/gebavadalovega.pdfIn PDF document text
- https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/623f065aed934f6977cef74e2b8aabb9/momugobejinovivoxowogiv.pdfIn PDF document text
- http://www.darvidproperty.com/news/file/fesikokulosonukes.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5e30fbd9---mosadixododasiwiwo.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4c6d6420ffe57971ff58d8087152b1a4/xolomajelonew.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/shspp0viud99mnvo3eq3flrvje/89999537978.pdfIn PDF document text
- http://mosjob.ru/images/file/62974579982.pdfIn PDF document text
- http://dsagco.com/Upload/file/togudalamosunivogup.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877f6e2ebdb---niporil.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e021b42bd676be97ba7ca9ff13f76273/59168467425.pdfIn PDF document text
- https://sinhadventure.com/uploads/file/jejosozodibopujoji.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/26300598255d36c39f6007fefebdac40/vepokiw.pdfIn PDF document text
- https://carlojans.com/cms/file/zuxipiwetefepipinibujabi.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/38304327342.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/luzoxaz.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7a7d4911708c53cdbe3c49dc81d5f1a1/11110568980.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_off00010018.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10018	10648 bytes
SHA-256: `25f696bd987d3188fa10f83377b42260b976a012d14eae6715d93cacd3ad12db`
`font_01_sfnt_off00011869.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11869	16272 bytes
SHA-256: `8816e853bbf54128f0aab625970a3c2bc8ac2289a913a5473d71c979ba0063a5`
`font_02_sfnt_off00014272.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14272	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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