PDF malware analysis — malicious · 0aef7b4cd265d685

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 16:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 65b50d6c5b09cdc3ad02fe1064d708da SHA-1: b31f19a926e4a98aa51a5dd4081a03daef59f192 SHA-256: 0aef7b4cd265d68510e37cbd983f4cb833869d5a32a1a6de7c65c3585a531005

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=timetable+for+9th+standard PDF link annotation
- http://mazurubezpieczenia.pl/zdjecia/fck/file/38976212217.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a16548f5---xeromat.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f328178129---64195958289.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1c1b5965fe8a0e8cdfe77b524c67e922/78683230996.pdfIn PDF document text
- http://tribo.kz/userfiles/File/49654574588.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720fc781c40---bezutokuboveta.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071290b83f97---10694923958.pdfIn PDF document text
- http://viajesalaos.com/webroot/img/files/46763325573.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aea10924ef91e429ac70c375b5b0973b/kawebifidawovoxo.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a810c400---69948169558.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a92095700---rilagol.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b59547ad---74301454192.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eeb398ac4---muvenebup.pdfIn PDF document text
- https://tavio.ru/files/file/polobiwugunek.pdfIn PDF document text
- https://ckd-otto.com/contents//files/liwevarex.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c576e3ae884---93006410601.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10961db46---gadizewo.pdfIn PDF document text
- http://sns-russia.ru/userfiles/file/jasudulakizo.pdfIn PDF document text
- http://cmtsport.com/pliki/13403904600.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced52eb259---98364248220.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2bef652295a4dcf96a7fd6dffde94d17/momopudogim.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e94f068d---boxosepolatatozi.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8de6a290e20afe273baa574b7b1e24ac/51778799007.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39f6985a09145a3d91f8f972b7c66197/kotenaputuvaxuxabom.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_off0000ec53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC53	17216 bytes
SHA-256: `15d2074086ba91b8054b8d1d0cc2f5c4fdb604ccc773661533588fba69e5b3f5`
`font_01_sfnt_off00011986.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11986	10892 bytes
SHA-256: `8612ac9f8b45da58596a2555f67d4c8f9800f7c616763e862d665a63388499c4`
`font_02_sfnt_off00013285.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13285	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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