PDF malware analysis — malicious · 752ff31f5bd5d8ba

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 20:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 6aba02f897d936dbf6e4674bc0de9912 SHA-1: fd10ed812fa1372effbec586d23ee89c2f7d7ce3 SHA-256: 752ff31f5bd5d8ba23ffda66fcd7a6c9cfd878ba9dbc9906e4a70ef423a1a3c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage potentially untrusted hosting.

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://inwebjor.ru/uplcv?utm_term=nyc+doe+payroll+schedule+2018-19+pdf PDF link annotation
- http://baracenter.be/userfiles/file/zuvutinomi.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9b2b8428---55400251874.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ceec3491f---14439729563.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/848368f3cca13983b9d1b11736844d7f/4368212310.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832da2a6665---kiwofikigesuxoxadadivifex.pdfIn PDF document text
- http://chayka-svg.ru/files/11394069024.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5qfm09edu1vvj8iro9ks26g75i/50990872494.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720cbb1a90b---pedepuve.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47f20fab6---notivofozujunetukux.pdfIn PDF document text
- http://swaving-stalinrichting.nl/ckfinder/userfiles/files/bezinowevari.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba657bb6082---75881143466.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/01d1a9f6c8d2a20dc8ee7948004f9b00/dusaru.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf6882f82---33440573379.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8f77fa2---sujabiliger.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc1a10d661---vatenolipaxosi.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/353a439e9a72c7af192853b293216096/79171464255.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/gbv65nalrllmspftu2qh51v76j/87850521590.pdfIn PDF document text
- https://suma.ca/upload/editor/file/57331468646.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r31bpaa0u7p2vs1f3d9vluosv2/jejadupis.pdfIn PDF document text
- https://argumentua.com/i/file/21243161995.pdfIn PDF document text
- http://elencostruzioni.it/userfiles/files/mirusevinaz.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/77758677144.pdfIn PDF document text
- http://tetobox-budapest.hu/uploads/files/lukunirulobe.pdfIn PDF document text
- http://sirinthepgroup.com/userfiles/file/76400710501.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_off0000da93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA93	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f2aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2AA	11320 bytes
SHA-256: `b234ce28f1a47ababbeabd6f6a7df7ee377aed0ae6b7995ac3ad838c82204ebe`
`font_02_sfnt_off00010d8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D8F	18188 bytes
SHA-256: `a21437343a44f5b97ba5daa9197386b096c3890e93e50954279ff7b7eaa43bf0`

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