PDF malware analysis — malicious · a4668ef9e3f81f5a

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18

MD5: fb8a6cecfccd6c967fd009957681676e SHA-1: c77f32c7b13352719c1b52defdf553b6bc6bf53a SHA-256: a4668ef9e3f81f5aa7f7f4f86fda799b7774d9cd07cb71f4045de475cae9a90e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host malicious content or phishing pages. The embedded URLs are likely part of a campaign to redirect users to these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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 http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662dd9628d---72790557151.pdf In PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3825cf8---vipuwuxuzonobixofawexob.pdfIn PDF document text
- http://ksklinika.ru/ckfinder/userfiles/files/62249345540.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ac612b29c---vuwadomotisu.pdfIn PDF document text
- http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/rotagixabuvuv.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fde7773f---5025808909.pdfIn PDF document text
- http://winhazel.com/indigo/ckfinder/userfiles/files/57383168498.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac3a4c3f58024fc3960e244e395d5bb4/72628490719.pdfIn PDF document text
- http://gildiamasterov.ru/userfiles/file/fekoxegetiboneg.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72461602ec---2803088251.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97e8a331aa---linezajodugonatokogar.pdfIn PDF document text
- http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/nagusuwor.pdfIn PDF document text
- http://esoftland.com/userfiles/file/72021135711.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f04f795a1df56a3d9e294bba3e2ff9b4/88071091699.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5361b751b---rivowigukupisat.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bfb794dcbca3e35ed7978df965ace9fc/nosuwutusadalozol.pdfIn PDF document text
- https://volgogradexpo.ru/ckfinder/userfiles/files/wupabelekus.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e5k4r6lt5ugeap31gtab4jbl5r/7715008124.pdfIn PDF document text
- http://softwarefactory.nl/images/file/91007246216.pdfIn PDF document text
- https://ural-aiti.ru/admin/ckfinder/userfiles/files/10213132811.pdfIn PDF document text
- https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/1t2u7fv9lhrh2cjvkbks8rp74f/78465942218.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df9496410---42448953515.pdfIn PDF document text
- http://deauville.ru/files/file/80888216914.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b818552c43d---72905046645.pdfIn PDF document text
- http://tydafa.com/dafa/uploadfiles/20210727134849.pdfIn PDF document text
- http://swhos.com/upload/files/vasomox.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=micronutrientes+y+macronutrientes+en+las+plantas+pdfPDF 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_off0000c7c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7C7	10988 bytes
SHA-256: `35382db8b3d7d45a5effb31da97610f61da0bd82f2a5188495e6e23020a88db0`
`font_01_sfnt_off0000e156.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE156	17452 bytes
SHA-256: `227878325264592a47ec582a5fade52d9eb374da75161bd28eaa9deec848893c`
`font_02_sfnt_off00010d16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D16	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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