PDF malware analysis — malicious · b55b857e91c2d712

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 7ef6c8a04bcb0cec4054f4a3fa17ba8e SHA-1: cd7e96b327502aee47d458573b05f08a79bdcc4d SHA-256: b55b857e91c2d7124c25c1c63853ad2c96a63a894b1854db126a0a195cf022d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://efsanepin.com/calisma2/files/uploads/55295783185.pdf In PDF document text
- http://cutyoursupport.com/userfiles/file/74374853469.pdfIn PDF document text
- http://lindseyderence.com/userfiles/files/binepatafizot.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c694b4e1516e17888495a41356f0abc8/wolovanubu.pdfIn PDF document text
- https://truckforceone.eu/upload/editor/file/dejojinuxivasosodaroton.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/88021370990.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f7606c6e---92244054050.pdfIn PDF document text
- http://zap-interactive.com/uploads/files/89203424564.pdfIn PDF document text
- https://healthlantern.com/ckeditor/ckfinder/userfiles/files/jotivotipukaxo.pdfIn PDF document text
- http://architettoannalisatinelli.it/userfiles/files/gokedodetitajubarezi.pdfIn PDF document text
- https://cmottaviproductive.it/uploads/file/nuvadeka.pdfIn PDF document text
- http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.pdfIn PDF document text
- http://rzn-house.ru/upload/file/kuremevonov.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348865531d0---74423888762.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
- https://gloriamus.org/Uploads/userfiles/files/xumatux.pdfIn PDF document text
- https://pypconsultores.mx/userfiles/file/goguzi.pdfIn PDF document text
- https://searchlink.org/userfiles/file/29610840847.pdfIn PDF document text
- http://seattlebestteriyaki.com/uploads/files/37857089614.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/85736940866.pdfIn PDF document text
- https://cuatudongsaigon.net/uploads/files/mikiruremav.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f48ae888497d4aab04cd98e925ff4a09/powixuvamevepovil.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc970a4d2---kuxiwoxofosizun.pdfIn PDF document text
- http://studiopignotti.it/userfiles/files/rogenanikefuzabawe.pdfIn PDF document text
- https://keluargamimpi.com/contents/files/41766665397.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=maquina+de+coser+singer+antigua+manual+de+instruccionesPDF 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_off0000b76b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB76B	10952 bytes
SHA-256: `fe529bf64a245f89993b96ed6dbccdf9d638018932c2302fcecc358c9cfcacbf`
`font_01_sfnt_off0000d04a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD04A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e85c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE85C	16416 bytes
SHA-256: `b9977eeafffe787a1bd503a2f5e76b78d7786a705123a666f7eb24bec51b6223`

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