Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b67be9e5456ef5b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e88a873a30b2a832e0879fa0f54c8f4 SHA-1: 3035fc9428af9546929bc55d3c1881697c3ef8e8 SHA-256: 2b67be9e5456ef5bac1fc3149180d5cbb819a7b3a9ee394dfdc8e19e1d951cbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with several heuristics indicating it's a link farm hosted on potentially compromised or disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 https://mollis.rs/files/68481665126.pdf In PDF document text
    • http://sukhonthip.com/file_media/file_image/file/tutuxuzogetirewafo.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/717988502.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wivuxodupawokov.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/47199954918.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/xoroj.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/veguse.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/3973860252.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kegifokupofumizofiguju.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/4583168523.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13041736329.pdfIn PDF document text
    • http://lizhechem.com/upload/files/22160886304.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97605790648.pdfIn PDF document text
    • https://grouptm2.com/contents/files/foxojimobixogapodi.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/7374091643.pdfIn PDF document text
    • http://nfc.soo.jp/file/titep.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/wetugomujizow.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/59441497013.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7511b591d---noluzow.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613548e399f31---77055338211.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a765526d---gazowuzuwivep.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6unpeqar77l366hhaq66g4ca65/mabonobanotudosonodes.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/desodeme.pdfIn PDF document text
    • http://sbairs.com/datas/files/67623030300.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/lobugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+word+android+appPDF 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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10232 bytes
SHA-256: 731e537862a8cae45040ff0f2432a1f712c4ab7c5e9101aa825a9ddd2ec5e8f1
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 17572 bytes
SHA-256: 6ee82e311b595461309e7f77bebbcd53e4721665cd7d3d45cf49d49d30a4d33b
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1