PDF malware analysis — malicious · 87f47f0b0d7e8811

MALICIOUS

PDF

85.6 KB Created: 2021-07-09 12:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 84ba09f918ec7e2d50395076d9a40a45 SHA-1: 7f6dad1cc08b7c6f3b3ce21b0f7d2a9d940d000d SHA-256: 87f47f0b0d7e881184fc84c5fa36aaa836dcf62695f1fba94cd90904a96be047

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to lure victims to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://chcial.ru/uplcv?utm_term=printable+diary+pages+2020 PDF link annotation
- http://banghetretruc.com/media/ftp/file/jejiviwigefogizasasasi.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609773cd22180---491366261.pdfIn PDF document text
- http://cherriestattoo.com/ckfinder/userfiles/files/7794043996.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8132f92538---12366195679.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c430dd44---58863946409.pdfIn PDF document text
- http://herningbadintra.dk/app/webroot/upload/files/lugarisamipusonopovunaxuz.pdfIn PDF document text
- http://www.aqsclimited.com/EditorImages/file/53239989862.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635b436f8f---davegepilitime.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bc6c10188ae064bd24a4e6e7b90f6526/tawabumeribuluxewosejew.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9342aca1b2059pn704enca8soj/zerudipowosekevidawu.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0febbbe7d314559728de2a858f35017a/28367797557.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070e04137473---44164319185.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b6796745---zuvomekonasegefedegoko.pdfIn PDF document text
- https://mvservice.it/file/54173447372.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/gotukovevebapupa.pdfIn PDF document text
- http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/suwunafapuruwewa.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/76561520137.pdfIn PDF document text
- https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1aec7432---30304523252.pdfIn PDF document text
- https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/64057695569.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0bf0b25---baduzaviravivef.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5ff3aa8d---mewinuzewonufa.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075855402b55---satoru.pdfIn PDF document text
- https://datatech-int.com/userfiles/file/bodekuzudanotumab.pdfIn PDF document text
- https://gites-les-bardots.com/userfiles/file/11096234222.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/83eea2b1fc1d4cf9e933da94b228e33a/xurovatodipodavexanuwu.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3720d773f84afcb5e488de77a941ca79/94509826313.pdfIn PDF document text
- http://rajhansnursery.com/userfiles/file/malusafotudupote.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_off0000eb9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB9D	16996 bytes
SHA-256: `2d4818def8596b68de7df8ec7b71c0f704645c73530cfe8b8d29e6e1cc17ddff`
`font_01_sfnt_off000117e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117E1	10944 bytes
SHA-256: `7d8e23ba3e9d17cfa4dd4ce1ea93b4756b12aea81758d5515043ae0d1e5fd4f0`
`font_02_sfnt_off000130ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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