Malicious PDF — malware analysis report

Static analysis result for SHA-256 72921cfef15c64bb…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 19:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9355dc0777eab589b322766c1d3b3f0b SHA-1: b6371878d9700e22036c465bb30fb6804923f471 SHA-256: 72921cfef15c64bb202ed0988a9eb2a35ab2cb91f5d7d0841dc6d5b9ce6e8520
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the embedded URLs and heuristic findings confirm its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0nbahei9sa91b6hsu1flmmjkkp/6357994003.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019d708685---80681268891.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/kakufa.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c487b430938---40829971441.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f89c41de6---firejeropeku.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/64350240f9ae2494db26cec70c9a1fe7/dovixujijiwulomevunujaf.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/nimoxuwevas.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30769b970---valozubajulelaranirewu.pdfIn PDF document text
    • http://mp-journal.com/media/file/59568611429.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/wexofowijowapiju.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e96ea6b---bifizi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43a4c6b4d---54391333843.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p65tvk1p0jaoh4d95k2pqo6q2i/49956394386.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/168a8cff4984a2f9ad13e300d1b39bfc/32571779627.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dea388e---butadojazow.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8a4bd11c3099ec9c2f54d447e587f790/zagitozasimawavowiso.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0970afa7a---54176671780.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210521214336112.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/lafovamuvoj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b98f13a1dcd---xijowoxinug.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qp59foe385ehga4nt2kie7297d/56628562581.pdfIn PDF document text
    • https://paperland.bg/uploads/file/guwujiwunokak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ussd+code+list+androidPDF 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_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10372 bytes
SHA-256: 1051e360da5ecd9fa2575944f2fd33cd7fc039a86357163a8ea63269285ea736
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 17468 bytes
SHA-256: d884fd2a7e584379302da94cf132d188bd5d39241e3bf3e47c86b823b4d83d15
font_02_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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