Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba4871ab2cc80f0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 04:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45b9e9baaebe0f982f986416ef76503d SHA-1: e7a559f9529aea9b4e342c82deed2b690562dfba SHA-256: bba4871ab2cc80f0449b6218c35c9748aef82b37932e7b3fdd646db21175fa93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753812602e9---695542364.pdf In PDF document text
    • https://haidangpc.com/contents/files/86513673126.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jatug.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e2b6e2811---65399689720.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/nesojokawatuw.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/97204107725.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/38325479713.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/gexenukeposula.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/xerizigenomud.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/vadelevuruvuke.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7882f0aff3bf8ee2ed27c0ecc844c813/mapiwobosafosezamu.pdfIn PDF document text
    • http://portableandcool.com/files/files/tawomegataluxogelewuref.pdfIn PDF document text
    • http://mmt24.ru/files/file/xemagilanezawig.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/41402768298.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6ceb601c---56116078130.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/513bde08961022b98aaf4d2c8c9ddc0f/tepofiwubiletu.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/14718712620.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c599546ae7---48375597698.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6c3af03b09388d2522240800bd594a8b/44980163151.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/degovorovox.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a30fbd35a987fd8a150e70768ede2d1d/48964170071.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nobosuvopuxawekexala.pdfIn PDF document text
    • http://santeh.md/img/files/ledawuvawajozomi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6995506b4---97938470868.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/ruzizeguji.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/gakusifobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+file+compression+macPDF 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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 17520 bytes
SHA-256: 173a9bffd36b40e923e985198eafdb23a962aed92771df56a3bda2171c379e5b
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10684 bytes
SHA-256: 6c4c08ec57524250fdda5a400b81444de97a86305194ff961ddd0c54b115ea56
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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