Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9086500a7e5e29…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 22:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 416a5cf3896b3478136b6723436fe356 SHA-1: ff8d6103b658bcf32bc6aaeae26db5a3d0a4ebb6 SHA-256: 8b9086500a7e5e29ba98b0733f3458dbf80e2b62d36d6bc6c2e01532d0cf66d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thucphamtruongxanh.com/Upload/files/10347192127.pdf In PDF document text
    • http://milkyway-vn.com/upload/files/96472730164.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/rewavowigi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vajavojerisenetovuvutu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62809492770.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2ffcf27a---85024156883.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a295288b---74038006584.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/4658751840.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb735c1a8a---bekep.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390fc1061b4---gavaletoloxadadeg.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/manojubo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/33910590182.pdfIn PDF document text
    • http://4rrecycle.com/files/file/pisikaxi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613d277499647---47621414597.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vagukafidomif.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/22816552575.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161398d22e9d71---22406743099.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puzogewojupobinuz.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/4287750721.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/23150937787.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/jenezamatabiwix.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0909/86fea24d6f3b11d52fedff53624e55fc.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=q+desire+2017PDF 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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 17376 bytes
SHA-256: d503c7e1c9ea166a46ff61785e92b879af638104fe35a0497aa69763c9b0eb6d
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 10116 bytes
SHA-256: d1df18ec648ab3e03921f2903168efe81de5a6afc0c39dd973ead38765eaf063
font_02_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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