PDF malware analysis — malicious · 0b89ebd8263802a8

MALICIOUS

PDF

77.7 KB Created: 2021-07-12 23:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: a953bd1c33f93199dca3209f9cb729b6 SHA-1: fb93ec6fe3231c44e67c887053ea8a1bc88afe0f SHA-256: 0b89ebd8263802a81cd2d98aed438285ae41df972d8b5e281c2df65b75cfdee1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm hosted on compromised WordPress sites. The embedded URLs suggest a phishing attempt, likely using a 'download technical drawing' lure to trick users into opening a malicious PDF. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9829

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e7dd6ad58---fubunutebanumiv.pdf In PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/34f10fa0ccdff36f1e2197b96876a024/4375711828.pdfIn PDF document text
- http://zamokugrofa.sk/admin/fckeditor/file/47757558077.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e6cdb3d1---87940821044.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72113b2b9---xagopupiwiw.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5846c71d35de467549114d776e0ffcbe/toduwowafilozirajili.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840b2e745b---48183068363.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5321387b---kalopazowegoze.pdfIn PDF document text
- http://apvn.info/userfiles/file/logupurubosezojabenuj.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be3780db8f9---kepodi.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b445af3f2---2588101102.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/nisonize.pdfIn PDF document text
- http://allasclub.com/campannas/file/luvaf.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9p28054g7tt2j0felngn4vcnl5/3505398891.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/892438237.pdfIn PDF document text
- https://taevlingar.se/images/pages/file/powumix.pdfIn PDF document text
- http://inistor.com/ufiles/files/54195257362.pdfIn PDF document text
- http://fritz-fahrlaender.ch/download/96656366803.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fcd450bc1---19643566911.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607423068674b---winojotulakurawux.pdfIn PDF document text
- http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/lagol.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vn6jadkhruajnklvcfdr6dpha5/samevugudujomide.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/xazagopin.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/74vdnata4cdsu8h2epee58507u/48699071418.pdfIn PDF document text
- http://syuncyoku.jp/upload/file/10712010552.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/83099158395.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+technical+drawing+pdfPDF link annotation
- 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_off0000ce58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE58	10820 bytes
SHA-256: `5aa358ede5dc9844db0970c009c116e0e7c4cf88f55d56ecc4aada2d40d27c54`
`font_01_sfnt_off0000e70b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE70B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF1D	16412 bytes
SHA-256: `09df2ac5c7e46e4e82c6792938a87ddbefd7e3ff06c56257aaee827dc47c00bd`

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