Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a3b9918f383f84…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 00:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82599ffe51864118139fd00a09da9d2f SHA-1: 078bf7a47b386092f6e36e183044745bf5216ef6 SHA-256: 52a3b9918f383f848c387199f565f02de2bbe79fba1ecd165233f884076296f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crewmak.ru/uplcv?utm_term=how+can+i+cast+my+mobile+screen+on+laptop PDF link annotation
    • http://sino-web.net/filespath/files/20210913032016.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ebaec02---vabiwej.pdfIn PDF document text
    • http://df-2.de/images/daten/file/34626200667.pdfIn PDF document text
    • http://only-svet.ru/upload/files/5396055136.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b253b195d---66366662630.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/54971953380.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63748146125.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jifobolarik.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/58476378305.pdfIn PDF document text
    • https://network-italia.it/file/lufaketilabupuj.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/57468951407.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33a143b58---nizunetadabudelada.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/45335160788.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uproesk0qfrm2bmkhq8rqk3cr1/jomituzewa.pdfIn PDF document text
    • http://iltorg.ru/upload/file/tojowabexa.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gekadevubonimimum.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161384e2b0622d---rasasirekipalopa.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/63061919720.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/2514361497.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/16839271673.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/lumelifipogab.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/narobe.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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 10868 bytes
SHA-256: 0575821801cda5742d04ee11e37dcd94e8b92a5eb85db63597d3c6605e18eb87
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 17624 bytes
SHA-256: 656013a501851b4f78f73571891d1ed0a6b944112c48ea6c2eab810434ffba10
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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