PDF malware analysis — malicious · 98ddf88e6026775f

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 958306fb65a2039a7770f391d87bc981 SHA-1: 4c15baf56699f8ab006d7880a3b27ede26585da8 SHA-256: 98ddf88e6026775f960ac5406cf6ddad619451ff333f1e9a931ef1a0dc0555eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=statistical+physics+problems PDF link annotation
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/46ed9be4d521ab6c4505eac4e32bbc5a/19446475243.pdfIn PDF document text
- http://rzn-house.ru/upload/file/83016504666.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8474dbbfe8990c3c567c9421ae369bee/melibudap.pdfIn PDF document text
- http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/xokemodeworadatu.pdfIn PDF document text
- http://rts-3.ru/upload/files/96573162279.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1981492be---48880332319.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bf4d4a4ae713b5a59a2d9cdf79edfd9/82229451318.pdfIn PDF document text
- http://cityfate.com/files/files/383986777.pdfIn PDF document text
- https://dildendilecevirievi.com/upload/ckfinder/files/3243451043.pdfIn PDF document text
- http://aan.kz/ckfinder/userfiles/files/52497202967.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
- http://hidropro.hu/upload/7085376269.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a7883f60---vilamomobofilawakebabusir.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8aa111cfd---37888151642.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d927cfab---35749489569.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/9587997814.pdfIn PDF document text
- http://antwerp-reefer-tournament.be/argt/files/85519839796.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d323afbaace---8148502675.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/70689990839.pdfIn PDF document text
- http://viral-list-machine.com/ckfinder/userfiles/publics/files/80728124336.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/loninomuwowisuwudekevil.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b573oavgrbqk73rt6r2kpeuglt/60409187813.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/stdnihqq2gdc0pabks6l6f4pj9/9452695009.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160719fdc75825---24358253882.pdfIn PDF document text
- https://medpressa.ru/files/file/84896020652.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_off0000de5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5D	16280 bytes
SHA-256: `dbcada6eefb12413847f31e6e05c3aeb62dc3028f056cb8e300ea1517fb58594`
`font_01_sfnt_off000108a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108A0	10864 bytes
SHA-256: `2d02e7eebefb001740dc1ddc1ecf1f9d7aeec14782019368603b9520a380f8b1`
`font_02_sfnt_off00012182.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12182	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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