Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19e67cb6114d0d…

MALICIOUS

PDF

119.8 KB Created: 2021-09-01 15:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 475bb955e72231092a665282b0de6375 SHA-1: fb7255bebf3c06d82f1a1363a5b26878ab2d9af4 SHA-256: 7b19e67cb6114d0d83fe8dd5d26f9c3358739067719f03644d099b8ddb9eeb6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mmckno2010.zkosuchdol.info/files/1284434619.pdf In PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/44080518120.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/62397689162.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ade0f41ea08cd419ebd0b2fcc8a08b56/kajuzobabuguvapotuxide.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4bd083dc---33009056934.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/noteduwikata.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/41322882338.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/32b05324175ef46ea0aacda94b998109/mabomitigi.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/60306550592.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bd3jsco4lv47tmv26gtfh808cp/mojexomisikabuwewoledaki.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a23d8392---51949042167.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/8765328144.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/op4q2fh80f3996s6btb2e85rvb/56265692268.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/37067140548.pdfIn PDF document text
    • http://alltechsro.cz/files/jemadazo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/13247426205.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e0t199gji59v44lhh30ho6qef6/68950177836.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/peruvebepi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97918bc561b93512ae27f06b5d921e70/nexaxafotive.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/lofukimojasovu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/43e30e39a164afccccc4a081a039ecbb/gufaniwilujubudiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marriage+is+a+private+affair+essayPDF 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_off000170e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000188f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188F4 18644 bytes
SHA-256: 5d7af80775de2466660a1892f8eafb68032456f86b871070fefb09e1f9fbfb19
font_02_sfnt_off0001b87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87D 10436 bytes
SHA-256: f00904739e748d7d6aab4e5ef657fba330f259fb622b76e75e3557749a672971

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