PDF malware analysis — malicious · 6de3735c23f035d1

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 14:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9a8a88da1c5d966988a5fcb66db3f221 SHA-1: 2d1be60ef2ae89f50c18475d195ce67880121c61 SHA-256: 6de3735c23f035d1826b606c7ab2523cdbfc735aa513090162eaa44e419e37ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=8+ball+pool+auto+win+android+download PDF link annotation
- https://jajugroup.com/ckfinder/userfiles/files/rapodigefolunememato.pdfIn PDF document text
- http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zatoropoxujezepabopem.pdfIn PDF document text
- https://marblo.com/app/webroot/img/files/36462565601.pdfIn PDF document text
- http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/sapatelufelirulogixeluli.pdfIn PDF document text
- http://cn-daomeng.com/upload/userfiles/files/9659ebd20fe67987711f986508152142.pdfIn PDF document text
- http://huarui-bio.com/upload/files/gerazi.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcac66c45---40820379804.pdfIn PDF document text
- https://vanrun-it.nl/userfiles/files/zaginubuvofowameledasapiz.pdfIn PDF document text
- http://elliptical-trainers.ru/ckfinder/userfiles/files/98050616271.pdfIn PDF document text
- http://biancoacolori.it/userfiles/files/tukolenopinode.pdfIn PDF document text
- https://htlexpress.com/ckfinder/userfiles/files/tuzodilatakasosok.pdfIn PDF document text
- http://ukwoodrecycling.com/userfiles/files/25532342316.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/58678080175.pdfIn PDF document text
- https://goodmix-psc.com/userfiles/files/89520792653.pdfIn PDF document text
- http://cortabellanews.com/userimages/24725132000.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/80426947759.pdfIn PDF document text
- https://napraforgohotel.hu/upload/file/29853493619.pdfIn PDF document text
- https://arabadvertise.com/userfiles/files/mabemojanil.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/752de7cab89bf6f0bb1dd4b2cf53e953/zawubajemozejebuberiga.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349af25831---feful.pdfIn PDF document text
- http://designbeginnings.com/upload/file/61436003693.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74041121c---72178951928.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/481b8bcd6f50ce5a0f4c60441f53fe8c/77348028710.pdfIn PDF document text
- https://artistprasanna.com/userfiles/file/nolupasoruj.pdfIn PDF document text
- http://cinebuzz.be/uploads/userfiles/files/311272177.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_off0000dc0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC0F	16444 bytes
SHA-256: `95b516b9ec7ba9c05045b29f1fb8d57e8bcf2224c072b4e798e6c38883dca545`
`font_01_sfnt_off0001065a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1065A	10520 bytes
SHA-256: `4a4d31ace37f11cee6bbc51ff1dae9321c96b70bfe37e2a4457700f52d98757a`
`font_02_sfnt_off00011e30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E30	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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