Malicious PDF — malware analysis report

Static analysis result for SHA-256 a371d04d1ff9aced…

MALICIOUS

PDF

93.3 KB Created: 2021-08-10 22:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2010b61ed0c29da5939f95e284fefe SHA-1: 9e775761577df6d1ac64f1f476a06f368bf42995 SHA-256: a371d04d1ff9aced4cd0b2770ee2191914074aa5169a7d6b8429b89773148390
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i3m509j0063rqlrpfa3aqofpim/joduforunanakiburobepegup.pdf In PDF document text
    • http://moristas.com/userfiles/files/19189475674.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/faxozidol.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db101cb6e6e7e7291d71a592ac7eaf6/wetabi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/edf2b7ea725decd4343be29e2351aebd/59449473112.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/dirajo.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/28950220059.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v580u4rcvii51820tkhhceluv4/bulakatajibesubisuseloseg.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d73a6b3e---3630594426.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/batuf.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/fetap.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/buzeziboz.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8020fb84ea74d9d9ad76befe31b9d639/74445792930.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a993d2dd---64529725494.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160837c5dd790c---17713920631.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d5a4b3be---48891799327.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/84greh1b8ir2e1ln6hnkt5kga6/gitagaxodafigegajop.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e624607cf---80809949954.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/f9e1e9249676b338cc243c6e7ce9bfc5/xonerolalat.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/77416852508.pdfIn PDF document text
    • https://t2sc.me/userfiles/vanapowafupulezowilunite.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/guxivujuvelinuxepilunuwu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a989119fec2---lovitulanorimerovunolifup.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/67729982454.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b21b408b---zekexarugusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=most+dangerous+game+questions+and+answers+pdfPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/96490075743.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_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 17884 bytes
SHA-256: 1138f7784dc1d966a2678af89c7e84299046679679ce75ed9108bc2d714e87f7
font_02_sfnt_off00014d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5A 11120 bytes
SHA-256: 0592eadda89e30c4dbccde30ccb4a293b03db6369a628176971bad85f054080b

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