Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9e136af1ecd435…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 23:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bae205040f6eb5e0078ab95486bfe94d SHA-1: 8809be7d19e7eb41da4010c20fa4f820a2286321 SHA-256: 3a9e136af1ecd4356b13b0ba7697ff33856604f25feec34152499ca21e25280c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading a secondary malicious file. No scripts were extracted, but the presence of numerous URLs on compromised CMS uploads points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.findvoters.com/userfiles/file/sonejafexutobilexodopil.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160870c0d77d0a---vafulamowomanuloba.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5e024e431fc07bb7441c9da2821a7d44/ginuv.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/41bdoosk5v3r0nn42fp6fnm9ro/42143526459.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ghb2qjs0f4g5khhn9ngpofl39c/xixebaduku.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/34c3bd77846fd6a8f26f78d2ce8838ec/wekovijelalivoda.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/jarazaraluxinobozam.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1fac4a64720827aa431297c0b1781b58/97320526227.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c52193be0bff593d30e569e9c28b181b/xafivazijabinupu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/75325825449.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/puwut.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6be771988162f62ea2c7a901b7b5e838/pijabemetokitaludu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0bb52786---3943835136.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b80a8f9e1---72725358003.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/34640930110.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef8f196ab---bojupivukuda.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb37c49be---xuvinolesamalonov.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd41a6ba90---pugedamiposo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/41450228471.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vitivabamisexitas.pdfIn PDF document text
    • https://parc-hotel.info/file/wubibujitokesunaxosevifap.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/s18j6oh3fil5glh1gil1df971s/wewupiboge.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a6eabf35b---zujusowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=12+puc+text+booksPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 17148 bytes
SHA-256: 10973d4f3dff3b99fd9a1f7833d89941e1aff854b70d11f15bcc3e2c191772c1
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10372 bytes
SHA-256: 6818584d75166b366d363aafbed62f97c05350e84af8c37d9eb22f3a3494746a
font_02_sfnt_off0001398e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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