PDF malware analysis — malicious · e7b5556f20a17c7e

MALICIOUS

PDF

76.1 KB Created: 2021-08-11 15:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: bf440e0c5db6863b0e2a7f412deaab16 SHA-1: ae510ee332c3e3a0920931d0eaacb9065820666e SHA-256: e7b5556f20a17c7ec82e6bcc994036edb7229cc272cd183e358c316949a668a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=prioritization+delegation+and+assignment+5th+edition+pdf+free PDF link annotation
- https://unosms.us/userfiles/file/24732719258.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/92473147164.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/widapunawonepukeves.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d456754a44.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a336591d5---81008223032.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/xevef.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b039dc7---kiwomosapuguv.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ed110e4945c85b733bb2cf178e45415a/lenurilizakafuzufe.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082235edf511---60887097076.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9281sgja081uoiqct114dq2087/47832955201.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f756b8abfc08d0fd81ed6efea010d268/17375733953.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160819aae642ed---81887471783.pdfIn PDF document text
- https://projetounificado.com/uploads/files/kolajewejimefojopiserexi.pdfIn PDF document text
- http://havefuntogether.com/image/upload/File/gixevewesevepexezi.pdfIn PDF document text
- http://baheth24cars.com/ckfinder/userfiles/files/buwufasowirukud.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/18c641ad0fb7f8516b33b2d406da517c/9883285103.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0jua102gng28chf21fs70rlgcq/72452053338.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/825179ab9bca8acf52d7bfa9c235aea6/3304365418.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4c644f087a5f59831d7ae8e5f6932fd5/rolawas.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fe301d5e---93284336346.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mltr7dbcgqbe1l55261juc2ie0/58340764052.pdfIn PDF document text
- http://usmleworkout.com/files/file/57192823025.pdfIn PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/76349354561.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00213411d0---75718427700.pdfIn PDF document text
- http://liebherr-tr.com/userfiles/file/47583235785.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_off0000c284.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC284	16744 bytes
SHA-256: `22b47e51ff19ecf58ffde235824bdc82ebf5050ab7f183b19423bfb2f4340021`
`font_01_sfnt_off0000edfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDFE	11140 bytes
SHA-256: `ec7d307d026de7b1eba018db58275433ad94d0fc97fd0702dfed5801d5220f39`
`font_02_sfnt_off000107a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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