Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d5e0d1f42a747…

MALICIOUS

PDF

62.9 KB Created: 2021-09-16 12:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 345bd7c7dfbcaedbdca62599a81c21f2 SHA-1: 28181317c1c620befd3a39c2d6d67558c1828838 SHA-256: 501d5e0d1f42a747d38fe261d09a76a441f6601111ceca32bc68a7468b5843be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

Heuristics 5

  • 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
  • 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://cyberbirddog.com/userfiles/files/topaviwanuwi.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e503af57d---40008812275.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofawakafetetof.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/dilarefugepafomodoposebek.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pudexewimujod.pdfIn PDF document text
    • http://ipllaser.in/uploads/zavojeg.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nediwigitilibuluketu.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/lofekolomumopufozew.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/pakaxefakoxexosu.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///27340080212.pdfIn PDF document text
    • https://mimpishio.com/contents/files/94642710539.pdfIn PDF document text
    • https://harmony.im/userfiles/file/65179457476.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1061307da---dadonenuzu.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109061753376140.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/nipowojida.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/83984092791.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/xugojaluwinexikosutuj.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/12010901530.pdfIn PDF document text
    • http://bresky.cz/res/file/kawimobazadotonumokuz.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/fagivaxaveja.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140576b94757---1321410638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=onision+in+real+life+watch+online+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 16344 bytes
SHA-256: 68253d48bfed72a6ba3b74d143b65e16a0dc4ba2b2a1de0e2bf5ebbb5f87ac64
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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