Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba23d95e1c7fe028…

MALICIOUS

PDF

89.5 KB Created: 2021-07-31 01:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a50a6db28e534c49dcd56e867b990ae8 SHA-1: de66e12cd20c6483aed8de0b051dab822c29cace SHA-256: ba23d95e1c7fe0288dd621eba7eb058eae4ce292115ba0ed8903dfa73cc06472
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://summitremodelinginc.com/userfiles/files/bofiwixetelexilasorola.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f7c11147---bafewoxuw.pdfIn PDF document text
    • https://wita.lt/images/files/kakinivotot.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/89566120929.pdfIn PDF document text
    • http://maclashoes.it/file/42974917655.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/16890965550.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/69005507019.pdfIn PDF document text
    • http://jainfarms.com/uploads/56514743053.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f6c0421c0cd550d8a9c4f0e14ce28be0/miretevofe.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/guretolas.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b189276f4---2686773894.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1497d181a---zojagozazufixaveruwigesov.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lizofoxexivexalekeged.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fcce4c6718a---94171361438.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bb03605bc1a44205969c195f8b0d464a/girevozezasazubimupu.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/lonoralorixomubefedesexan.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fm81f9uu3prkvm24er3hk2g1p6/rezijadixixekudazorilodur.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/26542717975.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/95166423233.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61facd8818---49219037285.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/79089508903.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/6361933829.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/54792408365.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/64042932848.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/luzojanikagevuvozimixow.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/14020926786.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/80010309656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=apush+chapter+5+test+answersPDF 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_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16920 bytes
SHA-256: f8bddc41ca1dbd790b7656deb2c9df94942517a22f28c611fbb1a575dd200dec
font_01_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 10512 bytes
SHA-256: 2195368045c1dae9756157542ae1b0a77c12b92902a0f523dc928f71abc3f0a0