PDF malware analysis — malicious · 0a273de5e4b7ae47

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 00:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 791b5a72f73a12b650af36be614e6eee SHA-1: 1c61e89d6bbae442b21963a17c005e31faff107b SHA-256: 0a273de5e4b7ae47215af6caeb41778db0192ccd962794c7f79bf6eb213d5910

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised WordPress upload directories, suggests a link farm designed to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=2021+clash+of+clans+update PDF link annotation
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdfIn PDF document text
- https://sapsda.org/SapmaUserfiles/file/sojafamufebekapijo.pdfIn PDF document text
- http://rw-hse-businessconsulting.de/userfiles/file/95867554297.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/46541585ee7fbb381076f09e0da97c71/jarutaligalo.pdfIn PDF document text
- http://www.gurgy.net/ckfinder/userfiles/files/wukozorizirodi.pdfIn PDF document text
- https://cafepiolho.com/uploads/assets/58701534370.pdfIn PDF document text
- https://www.opsclown.it/ckfinder/userfiles/files/siropovabe.pdfIn PDF document text
- http://www.kickcommerce.com/userfiles/file/6884557665.pdfIn PDF document text
- https://candbco.com/ckfinder/userfiles/files/jabirameba.pdfIn PDF document text
- http://vitalbafitnessclub.eu/userfiles/files/kenonusifavotoxa.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d329e7dfe8---29453078619.pdfIn PDF document text
- http://fueandhair.com/userfiles/files/zinobefejumeroxusikefe.pdfIn PDF document text
- http://dolonchem.com/upload/files/76811799694.pdfIn PDF document text
- https://wasael.com/userfiles/file/pafafodawebiz.pdfIn PDF document text
- https://inprovitecuador.com/ckfinder/userfiles/files/10577341116.pdfIn PDF document text
- http://podlahyadvere.sk/editor_uploads/system/files/5833088477.pdfIn PDF document text
- http://blackhorsesc.pl/userfiles/file/guwofeberik.pdfIn PDF document text
- http://chothuexehochiminh.com/userfiles/file/7566648149.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa7bc7450---59241479230.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614889ea8be11---98154032746.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/ximujenirawawuwutubek.pdfIn PDF document text
- http://tunecharts.com/userfiles/file/sosavuwarisupisog.pdfIn PDF document text
- http://ahnil.com/userData/board/file/62055048686.pdfIn PDF document text
- http://namngonviet.vn/user-/files/suwekipat.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb02a0d---vazezu.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_off0000b318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB318	10824 bytes
SHA-256: `2d7de711df5a0d22ef6799f01d1148888b48b58bb5b5dd04054b82c4ca72d8d9`
`font_01_sfnt_off0000cc1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC1F	15744 bytes
SHA-256: `f70bf02b495ddea66877e6313b564e05df78015f63dac7c05813f4dc3bc52272`
`font_02_sfnt_off0000f423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF423	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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