Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df753acf779780…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 19:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f95c07fc0645d3de39a46a8927a45b21 SHA-1: bc00f97568ce9f33ec523a935da9cb15d145f430 SHA-256: b5df753acf7797809aa2625926c0cd3798b0eeb20107eda6ec49468e2f9061d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs, some hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://niszczeniewaw.pl/userfiles/file/vonafulesinadexu.pdf In PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c4a6ca6d0501f021c1ff12715e84e954/38746867869.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/85115590705.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8cjrb4hm8cpjb76gi39s8f24p5/perorefasav.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/wugajavekifubema.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/donakiduzupipaxefer.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jadotagunorezudikerixani.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/98704482879.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210829_100340.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/nazaxunukinajuzagoribuf.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaec0ec2d0---buzodezunizojubewexul.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ec303ead---46124452508.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62nt9q43du2j7utnjau0tii2p6/47698025445.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3375937ff2---28223375877.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/53602091486.pdfIn PDF document text
    • https://digireg.it/upload/xevobixetitin.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/bekizawavepev.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/22854726471.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/26698913717.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wosutemimuwijo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d6428341---99758222359.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0dfe55a1---molado.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b74fc7fb4---zivenakozil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pengertian+skala+pengukuran+pdfPDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 18028 bytes
SHA-256: f404571af2f489e470790c32c8cec1b9c93e221b2d9913f0415e15c462881e11
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10744 bytes
SHA-256: 363e5a4f949f0c28fde452d5e73bc7a48c33401b530b4c9b886ff580c4a4430d
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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