PDF malware analysis — malicious · 0f51d1a6d4a58ca4

MALICIOUS

PDF

81.1 KB Created: 2021-07-09 01:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 78a15d369a654dd7e871f7ad601b123b SHA-1: b814c6c41e6c644c3a3c08398d051722dfd3b39d SHA-256: 0f51d1a6d4a58ca4f93cfcc4799cb0e162efd55361392747bfc1884d6902bfb6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being a spearphishing attachment leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=chicago+style+edition PDF link annotation
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f42bb6c7---gevesegiwafojanekuje.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e17210749---lekujewuber.pdfIn PDF document text
- http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/72017594685.pdfIn PDF document text
- http://laulumaja.fi/ckfinder/userfiles/files/66303455758.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e3ff1d8ba0156a12bfb3ae7d2595347c/sufonobanebobusojo.pdfIn PDF document text
- https://diaochue.vn/userfiles/file/15446372610.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/51865dbc4f511d7e68b140d28e87acba/50167590893.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fe189268456ca87f496a338e6792c7a7/dezalunupuson.pdfIn PDF document text
- http://htwy.com/upload/file/92573666530.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9d921cd9dbd61d54ef1bdd788f17a19a/49374157832.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac7ca34f8e---zejaf.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/54925862024.pdfIn PDF document text
- http://chekeeh.ir/basefile/chekeehir/files/ditupuzilikek.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9bde63d0d8d99a49a69cac4733ea6cf3/62286627768.pdfIn PDF document text
- https://tavio.ru/files/file/gimumirifusokusaf.pdfIn PDF document text
- http://timeyear-v.com/userfiles/file/1019319978.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c111e6cf9fd79e2b8f28841465a1bf93/6302038626.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3a1e43fd1---ruvotolatinesivofelapizal.pdfIn PDF document text
- http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/26e9ed2f6c92e98f7cd30241db071fe7/ruwijenora.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/939b3fe62e131e6907e67dcf7441e159/99430091194.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaaa0kddjgmhhb7nrsbeo90q1/fogogakejubomo.pdfIn PDF document text
- http://www.herbertvanderbrugghen.nl/draft/8427913711.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed93bc23f---52144879573.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4a02774142512eff7f6ac6ed9dac9a91/mozexipojilexobabifodukop.pdfIn PDF document text
- http://luluscafeonline.com/uploads/files/44221466119.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_off0000dc9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC9B	10696 bytes
SHA-256: `411f2eab8c26038d883e304b315251ecc021155574f471964abfdb5884315511`
`font_01_sfnt_off0000f4f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D0B	16284 bytes
SHA-256: `21acdfe72aa76d7e95f5b1bf8a48253c4c71a3b04e0d9216f19d6dadb377ef67`

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