PDF malware analysis — malicious · 7b7706e75836ce23

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 17:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 13d76da446e19f36f0a7e75753f8deb6 SHA-1: 2fb90ab6f214db02da4f898aabf5a40d3abea047 SHA-256: 7b7706e75836ce23176998c79d8dfa4937f421fdd487348beddfee8cb9bcda56

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to redirect users to exploit kits or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 https://catamma.ru/uplcv?utm_term=the+land+of+stories+book+6+pdf PDF link annotation
- http://thebeautyofdesign.nl/ckfinder/userfiles/files/20508035724.pdfIn PDF document text
- http://onnetsolution.in/userfiles/file/5037680189.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bbab907aa44149601f20bd35d883c76b/86560090795.pdfIn PDF document text
- http://1959blackshirts.com/clients/866684/File/8171180666.pdfIn PDF document text
- http://fsf-vastroad.com/userfiles/file/pavudobupadojubovofomaza.pdfIn PDF document text
- http://ladyqueen.it/userfiles/files/97647717813.pdfIn PDF document text
- http://szolnokepul.hu/userfiles/file/gunofolonavavawupefawifo.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hho9cnn5pr3bok7oedtvmam5ni/ketegozebinewijajugoxowoj.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a65af1466a4---51279228150.pdfIn PDF document text
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/94ca16f75728b62b5e794e70679f9de4/92708220596.pdfIn PDF document text
- http://forma8.kz/ckfinder/userfiles/files/siker.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7a0022aa12d989b8ecb8b8808d2ebb84/rotufenadowuvunorud.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/334614497eb59a5a491ff7d51ce3d9cf/dilagimewubuwiremeto.pdfIn PDF document text
- http://hkalc.com/userfiles/topugixomiwasaxokufipu.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f58fefe---pazejupixatigupub.pdfIn PDF document text
- http://akifkasaboglu.com/esatfisek/images_upload/files/72766853336.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4e9b5fb1070dedc52d22651db6d13546/fotopoxepo.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fbc2af77e2fef69be1084e60f316e510/35774960942.pdfIn PDF document text
- https://globalmediaminds.com/uploads/files/25983837895.pdfIn PDF document text
- https://himarco.ir/basefile/himarcoir/files/wafaduturira.pdfIn PDF document text
- http://axi-hohenstein.de/userfiles/file/93457436536.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/aa0673fb1efc1a398d3c8316fa23d8c8/tolekuliname.pdfIn PDF document text
- http://bungefamily.com/clients/5233/File/32049261852.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hor2te18c7pgl7o145hhhhlmaj/vipalujajijojezovopubexa.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b7e4ec25f---88985959984.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2a1ea7b2f1ad315d9f2205b873f8cd95/kedajenepi.pdfIn PDF document text
- http://cec-intl.ru/app/webroot/files/file/9795881558.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_off0000f116.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF116	10956 bytes
SHA-256: `148a7c32db76ff78d4763129d5121ca2a1347c4cbe863ee36f3b19a9c42c3a73`
`font_01_sfnt_off00010a37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A37	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12249	20004 bytes
SHA-256: `f6fe65ddd882e6ed8d702a78bbd2aad6f03c5aa096702427a7e2dc55ed797449`

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