PDF malware analysis — malicious · 64b76db793edec77

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 10:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 04375b4d8e3f5c64bd98708e87895c4d SHA-1: eeb79cac2ed61963f693f6e76b7ccfa24ff89b24 SHA-256: 64b76db793edec772b2c1d9b2715680c21eb9d4ca22a77afafd57b45e141160b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://ksuskalology.com/images/file/xaruwurol.pdf In PDF document text
- https://alkathirilaw.com/userfiles/files/43030953212.pdfIn PDF document text
- http://vinaaquachem.com/uploads/files/32564279493.pdfIn PDF document text
- https://retrofitoman.com/ckfinder/userfiles/files/55043520513.pdfIn PDF document text
- https://taxfirma.com/userfiles/file/44347754133.pdfIn PDF document text
- https://centrehistoriquesndbc.com/ckfinder/userfiles/files/15990165363.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614192c1144a0---24211395411.pdfIn PDF document text
- http://allivecoat.com/userData/board/file/89111567848.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/64565006496.pdfIn PDF document text
- http://molenat-energies.fr/molenat.com/images/editor/file/98521244646.pdfIn PDF document text
- http://brandorbit.in/userfiles/file/77954414395.pdfIn PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/64050549816.pdfIn PDF document text
- https://netcsemege.hu/ckfinder/userfiles/files/3412745412.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142accbeab72---35887812119.pdfIn PDF document text
- http://lavalnerina.com/userfiles/file/fewivobatomizoritu.pdfIn PDF document text
- http://ksklinika.ru/ckfinder/userfiles/files/jubumetoveba.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2e48ed7ed7e572529b798b12486fae74/30795708137.pdfIn PDF document text
- http://renknh.com/ckupload/files/85475879919.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153b70e7f1db---65383960099.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/zipivi.pdfIn PDF document text
- http://dichvugiayphep.net/hinhanh_fckeditor/file/46480866363.pdfIn PDF document text
- http://woodlandhills.ilovepokebar.com/uploads/files/gikavafux.pdfIn PDF document text
- http://slenderclub.cz/ckfinder/userfiles/files/borenokapiv.pdfIn PDF document text
- http://arcstema.com/userfiles/files/balofodatipad.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4468b22ca---82963467704.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dot+net+framework+4.5+offline+installerPDF 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_off0000b1bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1BF	15184 bytes
SHA-256: `d4bcbc9cd5b26d4c8875e11130b1fb3e2f7d7965e71c165b161bdbf21e572fe0`
`font_01_sfnt_off0000d842.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD842	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f059.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF059	10832 bytes
SHA-256: `99e2255d8bcdbc6021c7f2b9324da65eca01d63bfc976c1fbc28035c84b8c6eb`

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