PDF malware analysis — malicious · 435a1fb975cfce0b

MALICIOUS

PDF

115.9 KB Created: 2021-07-06 20:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 362dbf1db232e5fcfdd3cfe74718b4ba SHA-1: af8b1338e6e5705593183aed23bd9b1cf62a408e SHA-256: 435a1fb975cfce0bf51c7415ef9cfea3bb75b77a043051bdce82fdc4db60bca1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while numerous, are the primary indicators of malicious intent, likely serving as a lure to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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 http://anatolianlgs.com/userfiles/file/koxufujufovumosagemaluto.pdf In PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qjl4thje32ehgj0id11qek7lag/7692952921.pdfIn PDF document text
- https://beaszemin.com/files/xibomeduzonapunaliwenawof.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20a237482---tovavawito.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae770c4bb---jopis.pdfIn PDF document text
- http://thanuyentea.com/ckfinder/userfiles/files/wotizezejutufu.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b3e122a569a3d907f925b8ea22fe6fa/92860800634.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/vazivodobujubofexime.pdfIn PDF document text
- https://maximatrimony.com/ckfinder/userfiles/files/84554743483.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/54d5220a5de72c828b4a96c32f8f5dcf/3453343418.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c41a7e018a79c2102cc47ae8fab85692/77409252466.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de78a790fe---jijakikugarepabo.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa860cf39---84976626084.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c775b37886b---dajozamibono.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9a25475c---69865065770.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0f729a32a---12842687514.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a7b920b942220644e004c1fe3d1a1548/85563562544.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/90938754452.pdfIn PDF document text
- http://dafangtour.com/fckeditor/userimages/file/45654246374.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7ba323fc---14336644110.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f3153794---gosidek.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/wifetikitib.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1623216228.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=acer+aspire+5750g+manualPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f23f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF23F	10888 bytes
SHA-256: `c5842c9f215a87b868c22f5674fa1e0b17bcc187e983fac8a1a19ab2ce330b8d`
`font_01_sfnt_off00010b76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B76	19300 bytes
SHA-256: `9561ef1dcac971af37e7d54f5df11550c647e966cf057faa5f6cbf65083c469d`
`font_02_sfnt_off00013b9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B9A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000153a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153A8	38348 bytes
SHA-256: `7a7d57668b73ec6c5d9149ccb7c82ec1765b31439174b5825767f6bb5ad4bc34`

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