PDF malware analysis — malicious · 44d5b377ce92c798

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 92a94cf07f386d93ff94a363facd4f9f SHA-1: 89aad6c342f307d257b651cc24a9e664926cc492 SHA-256: 44d5b377ce92c79838d6730454e11dbd56a7ffeed5801af97f0952c42262d498

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's likely a lure document rather than containing legitimate content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://net-mex.hu/ckfinder/userfiles/files/gilotanunijolepimize.pdf In PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb9d8bfa5---betopabi.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac1e24680---fijatoxa.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d10ac45493ed3c266a3801bbac62c0d5/83987435635.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef0378db4a---81648180103.pdfIn PDF document text
- https://www.studioline.ie/ckfinder/userfiles/files/netabamokel.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/01860310ec9abc75d2886b519e8277a6/rudavopigafe.pdfIn PDF document text
- https://mobile-translator.eu/app/webroot/media/files/ralodokuwifizelilif.pdfIn PDF document text
- http://jr-bang.com/uploadfiles/20210704031435.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b28985689b585d120c4cbc418b96ff33/vibipowovalilefoxas.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a17cae8bc9aef3666dcf8d3406021044/vojikasebupaxupen.pdfIn PDF document text
- http://www.medicellbank.com/userfiles/files/nipowofifanoxusilepakago.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/db77d1496d79f5d19eb904f6d25f9aad/rumewasi.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786a02f8a0---39804742411.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bbd2e501---9837726541.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/10352464592.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4ddf6a66ab285699fa7336a987797b53/zulevofutesuwos.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077982c9afdd---sufukoraluxiwuxopudujomif.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e5595f9---pifenozuxamaki.pdfIn PDF document text
- http://beastyenergy.com/userfiles/file/poxubisuka.pdfIn PDF document text
- http://baheth24aqari.com/ckfinder/userfiles/files/21595941926.pdfIn PDF document text
- http://steelbo.com/uploads/admins/u0/files/20210622175009.pdfIn PDF document text
- http://old.smartplus.pl/ckfinder/userfiles/files/vepan.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/45914208164.pdfIn PDF document text
- http://africareview.in/userfiles/file/22744975810.pdfIn PDF document text
- http://ersatzmonitor.de/userfiles/file/jotenelu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minimalism+documentary+worksheet+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_off0000d8e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0F9	16904 bytes
SHA-256: `56bdb40ae44e319d5f38c55b84dca46b73be09c82389b4a10e3cc1eb0a54ff2c`
`font_02_sfnt_off00011c77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C77	11272 bytes
SHA-256: `39e44fa40800a2851c72f0db6b7ce72bd161e22a8268da89e8f6752388f89498`

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