Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9df7bd6f807e616…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 19:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05c58c2ccabe023eb99e755f5d38bdda SHA-1: 81633071d0f1e94b5f3375228eb205536d50e350 SHA-256: f9df7bd6f807e61621dc5bfcca0f233e036e5bdf76bfe10384badd3f498b5005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://luatsugiadinhviet.com/upload/ck/files/53295178302.pdf In PDF document text
    • https://netron.pt/app/webroot/media/files/luxuzigatuzivoref.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/tofakomozaneg.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/gejaxizagatowed.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/12795458724.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/39489922780.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6dcf798e8f7a1f4e9db347905b912fc3/tilirutufenadit.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/vupedijenumego.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1oievpbsverr7lrc7s4qrj64ji/31759893189.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210707043609.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0016f2a5e---jakuzikelazopex.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa0d1cad82---14095438672.pdfIn PDF document text
    • https://hgb.se/filer/file/jidunipuvavutekotin.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/ranuxusefakigipanenenok.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/di6k5inn30j6jpdtr6n9dqq6m2/rixefubosivikon.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9btke9ji4g0cfu956sieaug8m6/7486232475.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wesozivabixepenajepigor.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/dudamexojobadujelelizedob.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vubijoxopijix.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/96852098432.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tutagabufuvivafot.pdfIn PDF document text
    • http://epicridesnepal.com/files/boxavowekexivo.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/fapukudikatagoje.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/51028431833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=online+pdf+converter+to+excel+file+freePDF 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_off0000c9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 17916 bytes
SHA-256: 5d7d505fe0bd4eb935411d11a53b1b03001165fda82532225b5a8c44751cd6e5
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 10476 bytes
SHA-256: e7ae49d57f7f4adf6f76c83fb93b497442b1ea5742a57c394e2e3bbd43ce3086

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