PDF malware analysis — malicious · cea0f31084e19e35

MALICIOUS

PDF

228.6 KB Created: 2021-06-28 02:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 75d2b81b85ea7c6b81057ce32d765237 SHA-1: 33756288bdf32dc765478c7b6d0d63bb0e3ee8e3 SHA-256: cea0f31084e19e35b4f9ddb27b6e696d535c159caa001acb4ef6d8e4290cedda

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains links to external resources, with several pointing to compromised WordPress sites hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9852

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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.
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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a56cbf03842f9769ee09768e63273f98/45287151072.pdf In PDF document text
- http://beachfirebrands.com/userfiles/file/22060164373.pdfIn PDF document text
- https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/63031036166.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ace22c6d---nabeba.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q1ai7q8i1lq7efd4o79fa55hni/1178201586.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb6aa3a87---sirudi.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cf1645a3---gixopesebumitipitopu.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d2cd3f1a6d86f2078afaf77cb5b237fc/8549547166.pdfIn PDF document text
- http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/jinodagovirilazijijexetig.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db6a0b70b364fbea768a2e5d2680c99c/potitamiradiwifojeki.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a4ubl1i0tifsgk41sgm7omeikk/pasajugusujetejafupolopax.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a2410a3---18458521613.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883f6b68c8c---fanapinusarejababowav.pdfIn PDF document text
- https://organicfertilizerproduction.com/d/files/52046163693.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/57356295573.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de71d05af5---839005861.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b7c5094292b1ccd83cb73f0064bc28d2/gugipinijakikopamene.pdfIn PDF document text
- https://oversaslogistica.it/file/gamubakit.pdfIn PDF document text
- https://parfumzone.ro/files/file/lipadefoketanazoxosop.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/062f8aa4c06c4da2494109651c4c293e/91809237728.pdfIn PDF document text
- http://industrialdevices.in/uploads/bujudefazudadakovak.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ee2111d7---xegugiboxedizuxabekibota.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284f70a496---65266100714.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jr8i5c632in3jus84ta33u77d8/67877733005.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-1/20210501061750471631.pdfIn PDF document text
- http://granitemountainranch.net/userimages/46260005902.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+operations+management+notesPDF 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_off0003248e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3248E	17664 bytes
SHA-256: `c9a768ab6cf0f78249c1bc55a81db1a975577ea6610a4c9b154dc814208deb77`
`font_01_sfnt_off000352f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x352F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00036b0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x36B0D	10860 bytes
SHA-256: `e293dabedb289996185e41822adba3528f0bf1c0aac91b5484c6ae8d913716f2`

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