PDF malware analysis — malicious · af2f8b1cfff3de86

MALICIOUS

PDF

78.1 KB Created: 2021-10-08 06:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-21

MD5: fe21f778884ff9e1f27d5e171f023e29 SHA-1: e26dedd911ad20c5adb6a56bc7bc57cab607f7ee SHA-256: af2f8b1cfff3de86bc4cc72dcd9668ebdb3fcda413a8a7af19a851f99478ebf4

156 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=faulting+and+folding+are+both+types+of PDF link annotation
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/v7374773471r235jelcl99pfki/piroduvire.pdfIn PDF document text
- http://www.offshoreyachts.net/web_upload/editor/files/56809163624.pdfIn PDF document text
- https://christschoolblr.in/userfiles/file/bodip.pdfIn PDF document text
- https://dafelia.com/files/legibepazazojepalose.pdfIn PDF document text
- https://baptistfriends.org/media/fivepunemaliropixuwaxuse.pdfIn PDF document text
- https://rakowka.pl/userfiles/file/javelaxanugij.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/zajinipawebev.pdfIn PDF document text
- http://dopuskvsro.ru/UserFiles/45768139454.pdfIn PDF document text
- http://cbgnfinance.com/userfiles/file/62551620067.pdfIn PDF document text
- https://2b3la571ga-70p.com/contents/files/zidetapuzobor.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161589afd5d6a9---tavowefaru.pdfIn PDF document text
- http://sanphamhanquocymy.com/uploads/files/53652893542.pdfIn PDF document text
- http://kant21.com/userData/board/file/71703995900.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d0e4786ef---11179462977.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161565c2111fd5---birex.pdfIn PDF document text
- https://olterus.com/contents/files/rugegovugoxu.pdfIn PDF document text
- https://supermagnum-bg.com/ckfinder/userfiles/files/pepinukuveseborazajamew.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1615afda4e9cdc---46314138070.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/13702083305.pdfIn PDF document text
- http://wsm.hk/images/files/jarujinorekagofer.pdfIn PDF document text
- https://trade.inter-ural.ru/ckfinder/userfiles/files/3062597072.pdfIn PDF document text
- https://mondoaudio.it/img/uploaded/file/7603824962.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_off0000cc78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC78	17452 bytes
SHA-256: `2e22fda59a533552954e54e9225f7913a9c4d19078783a0797ff34a69df81ee9`
`font_01_sfnt_off0000f97f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97F	11108 bytes
SHA-256: `8f4a23eae3ce47c528386083260fe839396c804d29d44efe419e0cb8d715b7bd`
`font_02_sfnt_off000112e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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