PDF malware analysis — malicious · 893e0a651dbf4210

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 09:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 6402f8c3b6d3620f0b6b08c9573dfc3f SHA-1: 096e6f82404f4b002fa5e3c10664676eaa37981c SHA-256: 893e0a651dbf4210edc485216e63c0e11c6070af328bcd55374db037d54919b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=indian+train+game+simulator PDF link annotation
- http://itineraire-consulting.com/ckfinder/userfiles/files/1123979454.pdfIn PDF document text
- https://generalaudit.pl/eurostyl/photos/file/63555006517.pdfIn PDF document text
- http://acsalma.hu/userfiles/files/41054243026.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/189ce61192d8f28a69970935484f15bc/nokizigafonidujo.pdfIn PDF document text
- http://zentrumok.com/userfile/files/dolew.pdfIn PDF document text
- http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/tagakitugisemopokarod.pdfIn PDF document text
- http://ifa-astrologie.de/userfiles/file/75535094719.pdfIn PDF document text
- http://ergo-logo-bamberg.de/userfiles/file/87830880324.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ec253f36a---27065207766.pdfIn PDF document text
- http://lachambredechos.com/userfiles/file/677809456.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kazonajerad.pdfIn PDF document text
- http://piazzademarini3ge.com/userfiles/files/tusedexuvu.pdfIn PDF document text
- http://elsekmont.eu/userfiles/file/14190936226.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301fa536cb3---sezorezezixiwiradel.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/128a01309c5beddea3da0a52049f1072/7056459378.pdfIn PDF document text
- http://www.sospapa24.com/lib/ckfinder/imgupload/files/pukenomesaxawizikoge.pdfIn PDF document text
- https://xcheck.vn/uploads/userfiles/file/18988129815.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/5798896562.pdfIn PDF document text
- http://xindeshiye.com/uploadfile/file///2021090919122174.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a97cce2da---dodagaboberidagowuruji.pdfIn PDF document text
- http://tiwtactic.com/userfiles/files/nezomirefefi.pdfIn PDF document text
- http://gnox.vn/upload/files/firepatile.pdfIn PDF document text
- https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/38332473241.pdfIn PDF document text
- http://say-international.eu/userfiles/file/48850518291.pdfIn PDF document text
- http://nuovartea.eu/userfiles/files/murebusu.pdfIn PDF document text
- http://terwaarde.be/ckfinder/userfiles/files/kuwejerofigafuwodewuvu.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_off0000d90d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD90D	16716 bytes
SHA-256: `31d145ceafe2fbbc3f0ab586d735d2d1b59c80bf6db6a0bd0eff5653af39d2dd`
`font_01_sfnt_off000104bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104BF	10644 bytes
SHA-256: `f1437dcdc928215772b239d4caf78fd0c03210c022998160c24dd1ca601e7ef5`
`font_02_sfnt_off00011ce1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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