PDF malware analysis — malicious · a71d1e9da01cbe6a

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 08:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 885b18ac531175d750ca46e60a9fbb5c SHA-1: aa3f82a55dafb6d13716875a4f426d0bf8b9baf8 SHA-256: a71d1e9da01cbe6a2b8a12d6a09158ac8439ec3d1ee9d43878b7110ba2c80147

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The presence of multiple links on disposable hosting further supports a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee906b46370---filojogapolavosunomovuli.pdf In PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3b1ec9f11d7623c44ef9145c584a14d9/96077305679.pdfIn PDF document text
- http://firstcuwire.com/file_media/file_image/file/35821418703.pdfIn PDF document text
- https://murten-hotels.ch/userfiles/files/84052505087.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/58390920295.pdfIn PDF document text
- http://hotstamping.pl/files/file/papotaxizivefifusedu.pdfIn PDF document text
- http://demkapi.com/resimler/files/fasunu.pdfIn PDF document text
- http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/18335793012.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3077f0b8---44616066405.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/dofilatepabu.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ebb2dd2f4043b914c403c4ce105e3b3/jitajuvudavapolarizaf.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d79bca521f6---kolesixer.pdfIn PDF document text
- http://airfa.it/userfiles/file/xuparon.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/311de956eec4f4d4b7a743b6f2513fcf/16619068968.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c11226bf---12044025207.pdfIn PDF document text
- https://liur-krd.ru/userfiles/file/28864584580.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/51ab1ab2311647ee01890a52710849d5/taboxubudimezarut.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k7r51b0e35naock72ng8mn4e6d/4273103319.pdfIn PDF document text
- http://snotlicker.com/clients/10243/File/51489712574.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/gezowemizuwirobulixuxipa.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a24c743a6---musofa.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/96bf2965033fa51072144ef0c721af50/sawenewuwutumerebuzaxamax.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/907ee8089b8cd45c617ff6feec345183/56294936443.pdfIn PDF document text
- https://poker-fire.de/file/47166327903.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262bab5e8ed---fiwunobikad.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5886aa487a366d32e151d6cc3566ebc8/68905405440.pdfIn PDF document text
- http://hilimall.ae/uploads/files/41876276049.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cinquenta+tons+de+cinza+trilogia+pdfPDF 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_off0000dc90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC90	20364 bytes
SHA-256: `e35f1a6c73991eb2a7efe98cd05467316df6e4098eee452bd2d0d5a46bb1c641`
`font_01_sfnt_off00010eb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EB2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126C9	11132 bytes
SHA-256: `543825e928a8808018aadc95e856f457ebca730d4e67e6ee82f0693565cbfd16`

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