PDF malware analysis — malicious · 6d643f91ed2793e8

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 08:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 35c4d22025f23fef78604ed9968149ce SHA-1: a7292fa6723d96385ce24ccb44ffd6ef32765fb7 SHA-256: 6d643f91ed2793e8b55b574c4a18fd4302bc21f1a8839f58431979e189f093de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

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.
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://la-klamm.org/Files/files/zaxalul.pdf In PDF document text
- http://pomocnaukowa.net/Upload/file/werizujunezuromez.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238ac86d05---rananegemuje.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10ad527eb---winirokaw.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be763dc7a---xozovejenovigotegogukun.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6cf2990e---rekukukisaxezufanujibanaf.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5f6643e1aadf2dabbd406bd2408fba35/73473268767.pdfIn PDF document text
- http://tkhomedeco.com/assets/uploads/ckedit/files/20210825191200.pdfIn PDF document text
- https://perkunasstudio.com/uploads/files/202108171849312321.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da161e7e---retonipep.pdfIn PDF document text
- https://vas-vill.hu/userfiles/file/14974790919.pdfIn PDF document text
- http://iltorg.ru/upload/file/tiwawizekufukewazem.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jpumbvpm0hnng0b9hb9nko576a/webofikobubas.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee2c1d698797a5a5a287ee60a17d7d09/59394529672.pdfIn PDF document text
- http://2016.letnifestiwal.pl/ckfinder/userfiles/files/2819268765.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a717abe7---6855922871.pdfIn PDF document text
- https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/71676786829.pdfIn PDF document text
- http://preiss.at/upload_files/files/juwejinaravo.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f41d6262f19e1164943ceb59ff7d94fd/mawivofo.pdfIn PDF document text
- https://pottoka.info/files/galeria/files/22073262973.pdfIn PDF document text
- https://cncunse.com/d/files/xogofa.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bf69c6e1f35c6be504348b38fa749d20/7345620822.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2299508e---61046638110.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/64818577852.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be5fcab2d---44777103089.pdfIn PDF document text
- https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/kapozowuwedepujuken.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=thoptv+for+iphonePDF 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_off0000bf13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF13	15636 bytes
SHA-256: `94e9b2a4f7e6986e597722613d6080d00790b82293e51e93b2afaaf1a68dfe3c`
`font_01_sfnt_off0000e6f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF07	10108 bytes
SHA-256: `4a0a3ef4d8fe8ca1b0358cb4fec0ff19a48141a3ec79d0a71e568069c57e099a`

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