Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d2f596959061b2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 10:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 365273a3460bae6f80688f0412f80bd2 SHA-1: 3042b6c7e29fad4568d0732cf4634205cff33b38 SHA-256: a3d2f596959061b220807b77bd2309aa3562b088d7f47d58bbf4e13fb416e21f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and the ML classifier's high confidence further support a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://marsanz.pl/uploads/fck/file/zuxosugi.pdf In PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67486592923.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/59507912060.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b75efc5bcaae3fab47d1efa7266f30c5/62561048504.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/89699726470.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6bf9c4cc---73334190543.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a904ffc---mibajonadizeninunu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146227dbd4ab---27380878086.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5438cc15---tevovuzefakevagobixup.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/28873371759.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/52887605460.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/pirukonulowoxebi.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/xokovoxitire.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/77691001076.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/50002002581.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zumoninepitajojapemuso.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48594996085.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/39710363617.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/nipimibugi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/97208401852.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/tozawomapagixokipozudesi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sojonazudu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614720482df49---4464410606.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/retawavixozupusiguxobevot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+root+phonePDF 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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 9956 bytes
SHA-256: 5bd819bf4cbb5c24fea47273a2aa29550c82ac23d47be796f167b5332aad24f8
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 17916 bytes
SHA-256: 4d0baf1c5eb31fabd04d9d23ac1c8955c825af8029a184923ad1611ec2d91218
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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