Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f4a58cb9c86092…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 03:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a7f208ef5063dec10e78b106ccf3835 SHA-1: 5812b2ff15d7551af9b595b83ace92f8c72c1082 SHA-256: 02f4a58cb9c86092affb6d54c287b4cdeeea8b5957361d9913698376ed2abbd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=picasa+android+app PDF link annotation
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zotemiduxadeguje.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/uv0jhnrl37j0b0egjtlpu66vgt/56350436470.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/77207609987.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/bomegipinafawazumob.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353e5df1aa8---20707675967.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/kabavi.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901175420.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/62340187399.pdfIn PDF document text
    • https://advik.net/userfiles/file/80255705679.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/rujewiv.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/14318655032.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/85414339052.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/gutod.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tofisijakekegevofofujux.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131d301b73da---72783547211.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cc61ad9482e80cd6e28bc0c3563e4a65/jagadetomaromekulujobeg.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tumegawadedoxovewigum.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/kinotarigu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36740205225.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/famufugisapef.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lopiva.pdfIn PDF document text
    • https://thehouseproduction.net/file/borozovadizoser.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/90225666084.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 10232 bytes
SHA-256: 0ae7aa84fad9c2526e5d12d961e0df3c996bc9beeef92f242644e87cab7e3f9e
font_02_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 18056 bytes
SHA-256: 3ddc2398b116e183c84e441e05a221aafbd65d745bf63cd2f2142387c7d56d20

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