PDF malware analysis — malicious · 2affa4f2ecafe53f

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 11:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 3efd8dc80976daffefc050a0f0392021 SHA-1: 7d55c2e69da65a745cec0be2f97df6cea19b51bc SHA-256: 2affa4f2ecafe53faf6c76660e100788456250b00a4158f83f5d0ecd54e05138

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute further malicious payloads or phish users.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://bulgankhangai.mn/userfiles/files/fajujitetun.pdf In PDF document text
- http://mxm-hosting.nl/img/editor/file/wagusagawaje.pdfIn PDF document text
- http://singer-island-condos.com/userfiles/files/jenub.pdfIn PDF document text
- https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2d5179089d5df90f9328cc568ac3d544/29283281101.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7f0c7895e9cd2e104997fe7318d95fb9/87583264510.pdfIn PDF document text
- http://podlahyadvere.sk/editor_uploads/system/files/1174872854.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161270dc61f7a5---20517590987.pdfIn PDF document text
- http://angelofthewinds.org/ckfinder/userfiles/files/25139607830.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609287f759f04---60450740461.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b98f00d1---lipimitipa.pdfIn PDF document text
- https://projetovm.com/uploads/files/78231092227.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae3dea16a---saporo.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/56897299102.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/2699512558.pdfIn PDF document text
- http://photo-preiss.com/upload_files/files/xadigokiguvefiv.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/jejobimanedumuvosoxav.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/199a41f40a93ae298080c8cc789bcde9/69563750718.pdfIn PDF document text
- https://assignmentmart.com/ckfinder/userfiles/files/54678337303.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1081d195---67608918720.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098f61fa8040---76745329713.pdfIn PDF document text
- https://hojoairport.com/images/file/fuzazawetemaxivutefo.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160f426f21d3cb---64266165005.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/53gsokiabne1epq2hqqjh1dj13/24973243694.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df262e584ff---82187855298.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/gbnlckh5unf0v268uh73q80cne/fafubunub.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a372d2d45---dibopevafu.pdfIn PDF document text
- https://forssh.com/userfiles/file/ketawamomejubem.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kptcl+recruitment+2019+notification+pdf+downloadPDF 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_off0000cc93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC93	17476 bytes
SHA-256: `43a113ff82ec96b55dc54221a869bc20e915bcbe99c344bba262523914a04e85`
`font_01_sfnt_off0000f9c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000111d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D9	11252 bytes
SHA-256: `e6878868f3889e99d2ad9a12603766c27b316c3b393fd4e21fdb93d94297805f`

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