PDF malware analysis — malicious · 1aa57cfa46e12077

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 02:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 6bab656fa247c0fb8e3f0be28cef725c SHA-1: 18e46eef08e22b3a75e0f2aa79c3e15f32c0040e SHA-256: 1aa57cfa46e12077f58e1a3243c8a2043828f8518796e6e15a4007954a802df8

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to other PDFs hosted on compromised websites, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3cc74fe39ccf564dd784ef90b49f6050/75304354445.pdf In PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa18739f11---6641766488.pdfIn PDF document text
- https://edarky.net/data/file/puworeluzojexumejabin.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160791f5a38155---91109666369.pdfIn PDF document text
- http://ebd.su/UFD/7623/files/tokujusutogetepaligu.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/4240184253.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d372e70540---mudozofesuwamujezumu.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e4564332d---fujunokigedodebufijaboruv.pdfIn PDF document text
- https://cherrychile.cl/cherry/uploads/contenido/files/84183562992.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c597b7a220a---waliwupemijebozerumu.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/rijetux.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f702364073---17797493754.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68312ec6a---povemiboxepe.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609103b101ea9---31430425381.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/75854517067.pdfIn PDF document text
- https://curvy.tw/upload/files/lakirikojozasuxagom.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20284d90b---19361196253.pdfIn PDF document text
- http://imhome-listings.com/userfiles/files/nexinijapasofaxixitagar.pdfIn PDF document text
- https://shinaltd.ru/images/file/rilozurebuzijafuwaminu.pdfIn PDF document text
- http://metamorfozyayincilik.com/userfiles/file/3129503550.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8dcdd465b9e27ab8025610e084a58378/43662169706.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f506fadaa8eb2a600d09b6d56368059d/48392969851.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15aab6ab1e---71877189354.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9581e4d45---66799628490.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/bitedazoxiko.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=como+converter+um+documento+em+pdf+para+word+onlinePDF 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_off0000d72b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD72B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF42	10896 bytes
SHA-256: `aed6f57c96cc2deb3d1452149b60746bf49474b73d36853f30b8d0fd7850b978`
`font_02_sfnt_off00010880.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10880	20696 bytes
SHA-256: `4a64ff9e5cd20458ccbf9714cd5fee4e987e5872a7425e9178cd8a0e9a4bf682`

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