PDF malware analysis — malicious · f82a8b280e27b69e

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 16:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3e5e8f7c48a2401254dd8d3b1ac93177 SHA-1: 92deb18fb384efd08993771e3f1820b6baad9c12 SHA-256: f82a8b280e27b69e756b03bd16aba4dd135f6f1b5a85d39a8d926c07efc2c1c6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=bloons+td+6+apk+free+download PDF link annotation
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gvctvm28p9e7l53pilup8778ir/69190866988.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a503f54c3f9cdfabd59517e17d1e57c1/87852027156.pdfIn PDF document text
- https://nepalonlineexam.tisaracademy.com/userfiles/files/fibawasiwosoxonija.pdfIn PDF document text
- http://sgpeo.pl/users/file/22100969802.pdfIn PDF document text
- http://whygzy.com/Media/Uploads/files/72091880446.pdfIn PDF document text
- http://hnsunnyfood.com/d/files/73956603776.pdfIn PDF document text
- http://isspskola.lv/userfiles/files/61286532696.pdfIn PDF document text
- http://learnazia.com/fck/imagesfile/redegetavikuvesad.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0184874d1c9d75139c5e595127fc921d/65960100632.pdfIn PDF document text
- http://master-stroi76.ru/userfiles/file/kufujasetabimufinevurusow.pdfIn PDF document text
- https://gastriklandsbf.se/UserFiles/files/33404495537.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/277da0e7446135b2223ee2dd4c571523/dilubelube.pdfIn PDF document text
- http://weorderfood.com/uploads/files/lokurigem.pdfIn PDF document text
- https://franciscojaviermoreno.com/DocsCKeditor/files/tabumejunugaxovep.pdfIn PDF document text
- https://kham.vn/userfiles/file/91188922754.pdfIn PDF document text
- http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/62752590240.pdfIn PDF document text
- https://alatheir.com/atheirwsfiles/file/94450623376.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4a3f22da24df4b2f27128d8538a2f4af/6253266526.pdfIn PDF document text
- http://dailythang.com/userfiles/files/perapuzavufu.pdfIn PDF document text
- http://pravkniga.ru/files/userfiles/files/dasalarozatejuripolaji.pdfIn PDF document text
- https://inprovituruguay.com/ckfinder/userfiles/files/87731188790.pdfIn PDF document text
- https://cobrawire.com/userfiles/files/gokebuxaka.pdfIn PDF document text
- http://muszempilla.com/files/file/2264745129.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/fasoraroputelupe.pdfIn PDF document text
- https://legend-chang.com/UserFiles/files/2958614738.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_off0000b45c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB45C	15284 bytes
SHA-256: `87535bf000abdb7a5a9a5a7dfd686f46d8bc523bde19086ab4691cd6273a37f2`
`font_01_sfnt_off0000da55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA55	10796 bytes
SHA-256: `f4b3a0629855d14681333987df6554151407b8820e911dee766085af3bbbacf4`
`font_02_sfnt_off0000f383.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF383	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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