PDF malware analysis — malicious · 1d82ab89b7347b06

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 03:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 1ae81d457e27ca388b77db6af4374962 SHA-1: cfceeac00c3dcda13af291322960e79da24940c2 SHA-256: 1d82ab89b7347b060521f442ed49c70185dad1910fe3456eae731839bdf888bb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9904

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b1463874---fepuwumepopotu.pdf In PDF document text
- https://communeouchamps.fr/userfiles/file/2723143278.pdfIn PDF document text
- http://www.dean-cpa.com/files/adminpic/file/jofegufesoxewagoxoporuna.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bb42e8612---natefofuzibexexosovi.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9dac6c4c58cdc576d177a50fbbb381f3/wunotixazajezidizazu.pdfIn PDF document text
- http://aplus.to/userfiles/file/4917474924.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8f71b3e145ff675a668cc5393bca091/jowujexaku.pdfIn PDF document text
- http://tycoonmedical.com/userfiles/file/59625912668.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/6055066075.pdfIn PDF document text
- http://solmoda.it/userfiles/files/87773213811.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ticc6qql5ljqbac3ulg5plfs71/84879044558.pdfIn PDF document text
- http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vikebuzubijebure.pdfIn PDF document text
- http://verzorgingsindex.nl/images/uploads/79256177821.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c80350a63404c75d3f3426232f8144df/mujilifagotifasubowaku.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abc76b214---13279412565.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/88493013139.pdfIn PDF document text
- http://best-infosystems.com/userfiles/file/bokedulegazi.pdfIn PDF document text
- https://majubesar.org/contents/files/dotidalirizutezal.pdfIn PDF document text
- http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54230659995.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5t29mcvr35j0e8kd9idh73jod5/rajuzebini.pdfIn PDF document text
- http://master-stroi76.ru/userfiles/file/juwufozokexumes.pdfIn PDF document text
- http://www.prieteniitehnicii.ro/documente/file/86268345114.pdfIn PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/28750a04af6cfebb4efdf8ee6a2e60f4/xitowuvopoza.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2fdc68a33---7716178668.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75b277dc---rofulug.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/72700801122.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apple+cider+vinegar+and+infertilityPDF 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_off0000ee16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE16	10668 bytes
SHA-256: `4cfb11ed42a691f8fe4489c5ebce69acda1e8e09e56f57565a8801c82f4f9130`
`font_01_sfnt_off00010677.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10677	17752 bytes
SHA-256: `654ea036f8fb6abcf6479f84533382643d114184fe1804c4463558094ff38f1a`
`font_02_sfnt_off00013380.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13380	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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