PDF malware analysis — malicious · dfc3280dd39ffacd

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 06:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2dea027d2b032f2623736253c8584a94 SHA-1: 6aacb33b57012e7dce674959a7c8da2295325c06 SHA-256: dfc3280dd39ffacd6ac2f6a14e0b61fb556eb4075930f18b0b5d0633a588558c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous URLs suggests an attempt to distribute phishing content or malware, aligning with the characteristics of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=organic+chemistry+principles+and+mechanisms+2nd+edition+solution+manual PDF link annotation
- http://jcbcharpentebois.com/ressource/site-image/files/luzalileboj.pdfIn PDF document text
- http://855solution.com/htdocs/cljr/data/files/80857120920.pdfIn PDF document text
- http://kht.civilkozpont.hu/uploads/file/56561807193.pdfIn PDF document text
- http://vibrator4you.cz/UserFiles/File/15105774334.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c871e7021---94415712656.pdfIn PDF document text
- http://werkschoenenverkoop.nl/images/docman/files/80391054250.pdfIn PDF document text
- https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fumovexilawiwere.pdfIn PDF document text
- https://fentesmakina.com/paket/upload/files/41298589373.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lieh6k5glo3bmpni62oc4rtst3/bugakudoniz.pdfIn PDF document text
- http://taigesw.com/upload/files/zadumupeze.pdfIn PDF document text
- http://bunny888.com/ckfinder/userfiles/files/41364667616.pdfIn PDF document text
- https://afra24.com/basefile/afra24/files/dujum.pdfIn PDF document text
- https://gazeta-msp.pl/user_files/File/88131019747.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac524071cb---39920881326.pdfIn PDF document text
- https://www.mnogotrop.com/ckfinder/userfiles/files/52058690867.pdfIn PDF document text
- https://bahamianbrewery.com/ckfinder/userfiles/files/34741326442.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135108bed1e8---70851351334.pdfIn PDF document text
- http://icmasistemas.com/userfiles/files/45030086618.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_off0000c395.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC395	17956 bytes
SHA-256: `bfe1d184dfce57485d4f49601a3958c1af170f9b43def5becab5a31f7e51f7ad`
`font_01_sfnt_off0000f28f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF28F	11320 bytes
SHA-256: `995c45169fcf45d8a7c377f56438ad4d80cd0046f0b6cfdc6b3374d7dbab68a8`
`font_02_sfnt_off00010ce6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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