PDF malware analysis — malicious · 7b8a5f7a523b5cd3

MALICIOUS

PDF

82.3 KB Created: 2021-08-16 10:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 5ae5d37c6bd74d3a3d6a26939fa81315 SHA-1: 9a4bd0302fafb5aeee88fd3a2cc55e2d054b0447 SHA-256: 7b8a5f7a523b5cd369523d01e359d47a1d6217e39007a6494d13ec8652d8bd32

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=how+to+get+work+history+report+from+social+security PDF link annotation
- https://aradovan.com/userfiles/file/sobowegakutelof.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba5ed9d52---nufemunowefazis.pdfIn PDF document text
- http://cornucopiafrederick.com/uploads/files/lozimipowe.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/nesozadibeperevok.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abcaba3bc7c---torimufevanodimalav.pdfIn PDF document text
- https://seeyounow.net/userfiles/file/10401625502.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0c9e53266138fb2dbf27c44ef347ceda/6262360832.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/wudevosol.pdfIn PDF document text
- http://kssi.ir/public/userfiles/file/95842029882.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4adc266faca254d8c42ff59d5a127ce8/putupuzidenanawa.pdfIn PDF document text
- http://alliusie.com/userfiles/file/77220227649.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6860afcf1---98720811604.pdfIn PDF document text
- http://zonwering-belgie.eu/ckfinder/userfiles/files/maleluxuketewoxupejo.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4vtqdknm4uged7oar7njcsp5s9/numifawagax.pdfIn PDF document text
- https://soechi.id/userfiles/file/90515346976.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a8b57e0c---71392666111.pdfIn PDF document text
- http://okfilm.kr/userData/board/file/3524185720.pdfIn PDF document text
- http://sotel-perm.ru/site/file/lufekag.pdfIn PDF document text
- https://serpavenger.com/ckfinder/userfiles/files/fewabuzupojis.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075713112890---nezewibeleverepet.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/naxuxufutoledutebu.pdfIn PDF document text
- http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pimopufuzaruzu.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/7072151139.pdfIn PDF document text
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c9d2d9fdf1f53a134c9b914aff5f8a80/21750680215.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_off0000ddc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC4	11204 bytes
SHA-256: `80366cc7af172948a56168026c6882138e0d1d4c2f9876091b02a1df17b89c81`
`font_01_sfnt_off0000f81c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF81C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001102e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1102E	16636 bytes
SHA-256: `09516a4d00266c8176d864140265e06a1fb0b27ae8bae8adc309ee1410df0678`

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