PDF malware analysis — malicious · 75420135b3a47235

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 13:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 50b4d2801723936a8eb2cdeabef3b24a SHA-1: b8cd94a8793ed98d047e273d623679c09f8c772f SHA-256: 75420135b3a47235213a0e0ef039b8ef2c5386f788edc1d62b77482d2eed8f37

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to facilitate the download or redirection to a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=livro+de+rodrigo+janot+em+pdf PDF link annotation
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ce773164---66378236441.pdfIn PDF document text
- https://urologasdainys.lt/userfiles/file/jelurejawefeb.pdfIn PDF document text
- https://dermatologie-francophone.com/userfiles/file/vunov.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a79fc81bc96b126daefa1a83bc9fe3fd/7590282909.pdfIn PDF document text
- https://xnkvinatimex.com/uploads/files/lozolazepovunolit.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b855e743ff4---24041777321.pdfIn PDF document text
- http://breakevenpoint.pl/uploads/editor/file/83198617813.pdfIn PDF document text
- http://henrysadiereunions.com/clients/876463/File/gonus.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a5138b6a---40371354511.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d078232f8---gizepatinilujapujimopes.pdfIn PDF document text
- http://cristalensi.com/public/File/56555331882.pdfIn PDF document text
- https://vozilasavozacem.rs/files/kanerizuzudara.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fd8b1c67---96191936759.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6i0dsiqssv6jt28pj92v8313eh/14755891567.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4e89582962f70f98945d1f17fd7bd9b4/26390041509.pdfIn PDF document text
- http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/medezonalodomepisili.pdfIn PDF document text
- https://www.willmarshelter.com/ckfinder/userfiles/files/4521015159.pdfIn PDF document text
- https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b267ba7e38fdfdb22af2c76db404e803/72180022972.pdfIn PDF document text
- http://razzledazzleevents.in/userfiles/file/setixol.pdfIn PDF document text
- https://isleo.com/i_photos/file/57352866388.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92b933d68521fd6a5f6a0a87ce729551/6806984072.pdfIn PDF document text
- https://jamurgoreng.net/contents//files/23658546438.pdfIn PDF document text
- http://caratow.nl/userfiles/file/37903500633.pdfIn PDF document text
- http://handsonmontessoripk.com/userfiles/files/90197304812.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_off0000da61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f273.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF273	20060 bytes
SHA-256: `cd89f68cca0125044750d433b97731a6b021d12f9592d1e6017839cf0d55d4db`
`font_02_sfnt_off0001249f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1249F	10780 bytes
SHA-256: `84bf470cefa47ca4e37490dd9650b8201f35a44ad0026b2f9dc063eba2181410`

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