PDF malware analysis — malicious · c0dec32fb284966a

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 03:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4a28f4dee27ff23b68950d717f3cc05e SHA-1: 91e3dd22bfd4e1821de0f1e842f9c50350c0b5ae SHA-256: c0dec32fb284966a650df4b7533eb1ba31421f8512ed959890c1bd967ef8b35f

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO manipulation attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://crewmak.ru/uplcv?utm_term=what+is+instagram+lite+app PDF link annotation
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/26c06df668929ba07bf379d420e6a404/92878490508.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/54209221977.pdfIn PDF document text
- http://ateliergermain.net/sites/default/files/file/dolagukano.pdfIn PDF document text
- https://www.edmcenter.xyz/ckfinder/userfiles/files/bexapesilipifalewof.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/novevemivinuxaxeruput.pdfIn PDF document text
- http://auswallendorf.de/userfiles/file/xubokekogirefagutog.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/72398292851.pdfIn PDF document text
- https://pmsp-me.com/userfiles/files/43865365859.pdfIn PDF document text
- http://hichipper.com/hichipper/uploadfile/file/2021091118175873499.pdfIn PDF document text
- https://topclassgreenery.nl/images/file/lematapafemebewufum.pdfIn PDF document text
- https://curtain.jinware.com/upload/files/suvazunitabapowanaboni.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210909143537_1043373101.pdfIn PDF document text
- http://telecycling.org/files/file/wegozakorazuwip.pdfIn PDF document text
- http://pieseclimaauto.com/files/file/69474694760.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce8ca33eb---vupuliwinirilariw.pdfIn PDF document text
- https://everestart.com/images/stories/file/10044221773.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/61417538234.pdfIn PDF document text
- http://kco.su/userfiles/file/40691245394.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4c2054b409f17b6858b7409d6c761aef/36911990453.pdfIn PDF document text
- https://fengshan-zhennangong.org/upload/ckfinder/files/78514623520.pdfIn PDF document text
- http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910120944556742.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3799e86bf5c7a21b901cc54c7fc4feba/54767244688.pdfIn PDF document text
- http://geologicatoscana.eu/userfiles/files/4728734338.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_off0000dc17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f42e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42E	10572 bytes
SHA-256: `97661bb33536e7f225b09d7930ae038df09cb42490165e68b8bea46986178a8a`
`font_02_sfnt_off00010c16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C16	17472 bytes
SHA-256: `14a2d7c340a0ef952b18fa88bd0e5dc1ceb3cdb5081b7d047cb8c403a3698128`

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