PDF malware analysis — malicious · f37fcd5160c54ba4

MALICIOUS

PDF

73.3 KB Created: 2021-08-06 09:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 39c0b582c6cf01d3b2ac6d26bedcb431 SHA-1: 908ae41fb5d05fefe3c4b7b895ae2153a8dbb6fb SHA-256: f37fcd5160c54ba49a6a82a71249c58b8ea4fa57a824c6bcbc8c952195d0f8eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=molecular+mass+of+h2so4+in+amu PDF link annotation
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c1559ab5cfa84e626fe947bd1da49708/kevepabedazipaxurawosi.pdfIn PDF document text
- http://www.huntsvillepr.com/files/files/darifowiwetovorego.pdfIn PDF document text
- https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ddc944128b563214b21631c2d61c9b8e/5457863255.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ep1dnjn3nsoksvgviju3ajjko9/laraxagewe.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160717eaa5b5da---73477915850.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a3beebb72658850299ac5e55d5b9f9f5/vasafigoba.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5sksit8nq8mbi1h5s24sab54n6/samopiwuwajisuvoporeb.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/41829516405.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/61656132468.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b9889c62618dc70960608b6aa229f70/23669757202.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/sevatoxefupomosixodabu.pdfIn PDF document text
- http://spc1991.com/ckfinder/userfiles/files/kunim.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607642d4d4321---74328723106.pdfIn PDF document text
- http://arch-teh.com/pic/userfile/89961269968.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47f5571e40a781189730f5a2de6705f2/83925136393.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa401f78c9c---bowokes.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/97f9faaf1db7df6b1fa0072dc22a627c/depesugexeledifavapazumak.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3cce9301---zanubogadewi.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/sorodul.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9pjeo88bkr3daoqtd2043p2ubo/nojejofokugunezesoxo.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d056a42c---dumerabuwikefovadukokij.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/weniz.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2edba9d00c---13717706834.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd0e6ec7f---66893423540.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_off0000bf0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF0B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d71d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD71D	15660 bytes
SHA-256: `b2cba48d311e1556f437215f10337056bf54b16334e3261612132da5bddd8311`
`font_02_sfnt_off0000ff70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF70	10796 bytes
SHA-256: `6c25fad72f426d85fbcf3bb6fa36a0a404f53ccee19eb0d5af952b7925becb91`

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