Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9d4b899fd73d7…

MALICIOUS

PDF

147.6 KB Created: 2021-07-07 17:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 850f2afefb0aeb379367388d5601d493 SHA-1: c4ab3e65e434a80be2329ebd5f2a7d889d65a688 SHA-256: baf9d4b899fd73d7478ee4aa2266053bdfe1df9985b406731df437a467cb2757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document that contains numerous links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing or malware distribution. The document's structure suggests it's designed to act as a link farm, directing users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lbs4mihqqugdqcgn51upuua9dl/29491124448.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712020d7be5---6991677012.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c433f525c7c---39017202287.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjnggnh957d5h62ua87g2cvlq5/47863343563.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/476437bae5caa7e7343c9de50809d95e/lomagasaveto.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a542a4ebdb6---gagetupupofowatibuzu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/550ef8d9c693aaeaedd9207d4f833e72/64134153917.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfce75dec7---nomaxe.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zeladizasux.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd6781b9b2---75579349995.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c019303d80cce98443913d9027dd4c1d/jerutazivuviwodepi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04bc19d7e---34738673851.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071d48870f32---sotawoz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d26882d766---4578192399.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0db6d62503091250c1c6abb9e74e8299/72042772898.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/90823008147.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/51321029930.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/907e8c9afad5a32d448da14c9943870a/jovitodunibeloje.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16254778541796617466.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/187c462b589c3a82877b32e41ada3c5b/jubulopavi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/diviferonobonisig.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210630/2106301630414271341twl3y10t1bh.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/3865123053.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c1e31a6a7718511ebbb2c7fed8c199ba/26956254245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=example+of+written+constitutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDCE 17392 bytes
SHA-256: 79ed8c66f634b8a7506f19748f88c5453d91a51c47179dab254e72f6a79d48c0
font_01_sfnt_off0001d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D76F 22848 bytes
SHA-256: f32c492ad841bdc5870510c3ffb896372c19c4eb03b2c7f3ab12911103f521d8
font_02_sfnt_off00020ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000226bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226BB 10912 bytes
SHA-256: 55c31e9fabc74b46e4a646e0941493c3c1d2abd2959b5a57b8ffa8c95638947f

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