Malicious PDF — malware analysis report

Static analysis result for SHA-256 50038b51931319e3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 00:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5bb322729bc9b549e53a556109c4fef6 SHA-1: b6d595cc481e2e5d2a74fd1b68a79636f621eea7 SHA-256: 50038b51931319e3ae86258c620362a428b9e7dc2892b4d2133831eec6c59b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mabuksusu.com/contents//files/34852222251.pdf In PDF document text
    • https://urbanlivin.lu/userfiles/files/5512631914.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5c3b5ee3---xijutajalukaz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ebd745ec2c5ec2239d0acf1e58210e10/nefubomaribovemunatibetul.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/pawuxomok.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/rolepifekolupef.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/cca738a0a91b6ffc404ff23ecbafe8b0/31549363182.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b118eaa3659---dadisosudepitetozosipulej.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/837b5f4cf09896205fbdc6b2f6299ed4/sovavawepoxudu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a017c1e741---tetola.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/guvotesoxuzisatimurep.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/96239757408.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zudazonogimak.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/lubuvajonekotadifonowor.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/garimopurejulu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/gizisunifapajodav.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0d2c83928---97000681201.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/18788389906.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/55178363576.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/99384937359.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/xopopuwegalomojitaxitafe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e1776a83---pijekotavuxir.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wowuzumusajagubas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=i+am+not+getting+calls+on+my+iphonePDF 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_off0000c23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23B 15972 bytes
SHA-256: 5f8a26199cc437109fbaf0496315ffee31369e8c5f0c5287a218765dbf72cd58
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10784 bytes
SHA-256: 0999ec777efabf3343b098c5eb58f41525685e5167d0191bfd12afab23314bd2
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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