Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66bb04c66a8c888…

MALICIOUS

PDF

132.1 KB Created: 2021-09-04 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 972a16b5cd3df3c024a366464dbba56e SHA-1: 519c12e9817bedee294cf8f2129bd88c516780fb SHA-256: e66bb04c66a8c8887c7a339db4dbdca8c3b3ea2fe1d42b058f6877aa11dac4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://drafthe.ru/uplcv?utm_term=bemanningsavtalet+lo+pdf PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/q95jahd7uposcp3jhghv276aej/70265525255.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/73979667030.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161259483ce5f4---442258930.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/ferew.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/33294173497.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/23763182338.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/16043577493.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08b48671dafbf3eeeef54b17100d638b/foxijuno.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/44646819332.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pevixe.pdfIn PDF document text
    • http://winso.tw/userfiles/file/relinidovafuxazavifegiret.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/zebizakofuxiziretenoju.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/43300639741.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70d2250c6---tifav.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/99370838242.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/66409541200.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81578142002.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/10209334519.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/kuzetepuk.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/37533637409.pdfIn PDF document text
    • http://feg.vn/uploads/files/noxopav.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dghu31i46eta155lra2a37m05m/3744187663.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16259090221233.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d8eb266f0---simevokifuwuj.pdfIn PDF document text
    • https://cncunse.com/d/files/wovika.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.

FilenameKindSourceSize
font_00_sfnt_off00019b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9B 21224 bytes
SHA-256: 03daca2a74e7dec751c207c6e4b2ad67b002d263e0ecd2eac51295675eeae227
font_01_sfnt_off0001d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D152 10860 bytes
SHA-256: 625e0dbd31f531874a7beeef03b10162dd3138f7870b0ace5ff171956da7d398
font_02_sfnt_off0001ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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