Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de956f1501a438d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 05:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c948e5087feaeb2fc5bc47a5944167a0 SHA-1: aed671a98abf595ecffe0a3f111d920f1db55dbf SHA-256: 9de956f1501a438deab20024cb1fd0c31aba0c95e6ca06d9bf32b61db136037f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate this PDF is part of a link farm designed to redirect users, with one URL specifically mentioning 'lock video app download'. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=lock+video+app+download PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73ddef542f8de49e7b363b6dcbbdd9c7/xuvepoduvorakufavijuk.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///11332414443.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/89cb1a1aa562b10696b64bb8ed65c3da/xafavobakevurigebuxeposab.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kivemejoxawizojupi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/dilinoxidalupufomu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/89101909359.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109111913481363.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96644486539.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zeluzoxokifadufavusi.pdfIn PDF document text
    • http://3sdent.com/upload/files/dideluduzadiki.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/8822762297.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6395c34f2ecfedf42389ffa52d425f08/nuxepatadabavurogi.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/jogededobakofogugog.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/wogiwusifil.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/91075960685.pdfIn PDF document text
    • https://servicepapik.ro/files/72867495611.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39054953425.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/32300838724.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/4038711544.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/7b43a81556bbdb97df9ace7b6f4b3fab/41793261607.pdfIn PDF document text
    • https://areicon.com/images/file/minedivekazare.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2109e94da27e49d49debf4c84739027a/17030524385.pdfIn PDF document text
    • http://toonesk.com/upload/mowisawos.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/jorizulanujukemifet.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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 18188 bytes
SHA-256: ce973d9d7f23a4748dd73e2dda4893ef96c905240ccb1d31fe552a14ee85d0c9
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10340 bytes
SHA-256: f0e83e2c637641113de13b67110fd094503b1570502dba47d4bfbdbd6040f110

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