Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a82962970f8c2b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 11:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca41dbac3e0eabc2e79b5108deeb5212 SHA-1: 1b70e29a46fcf962d79a9a925556c5c7a6723def SHA-256: 83a82962970f8c2bd9fe1d7c9d261e413d666920dd1d65ad9ee641a4c3687934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=make+music+apk PDF link annotation
    • https://szallas-karpatalja.net/upload/71825390963.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/madobamumolebegixoba.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tagabenomulozaxek.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/6713333816.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sofawilelikozavirujupali.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/98717798297.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614615010a5e0---9060199143.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210916010335.pdfIn PDF document text
    • https://heyratacademy.ir/file/86906005717.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/6468846839.pdfIn PDF document text
    • http://hkwwta.org/userfiles/44750467606.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/80743534549.pdfIn PDF document text
    • https://telenovella-bg.com/files/6475252199.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/2939875861.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/ribexepemo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/savaparomope.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db781ee4dd---sisimivukenug.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f4f0a7a---latisakidaredawirikodoki.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/50006911286.pdfIn PDF document text
    • http://posuni.com/userfiles/file/xorogokiwugulozuvimato.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/ruporibidew.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3ce07e37---72692181564.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386210a238c---76128292687.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/59362178917.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 10252 bytes
SHA-256: 7977f2c2ab11fe4d41dffce3321bc7a39b117d34dff7069bd04ed3bb52e2d230
font_01_sfnt_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 15380 bytes
SHA-256: ceec02e2ac8531de1e18dced95d6a344e7977349ec77b7b154cb6c931270e17b
font_02_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1