Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aa211a8f226fe5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 00:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70c4e8c9cfbb5a98f657d7172f416015 SHA-1: 0ed3ca08a8ad58489c772686d8486caae9f64f46 SHA-256: a6aa211a8f226fe583f83171e1b7abb922cdff6357ab9f541cb8ff48a0728097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=tongue+attached+to+mouth PDF link annotation
    • http://meble-tk.pl/userfiles/file/11637989651.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/1625526163124279555.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/fijotusimazojezirovazinuk.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/118460288fd65a4f0085c057f1deb59c/19815322253.pdfIn PDF document text
    • http://kco.su/userfiles/file/95640900201.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/81324561991.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zojujuki.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e04658903---81644551470.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/tajazub.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160940177bcfbf---8666396309.pdfIn PDF document text
    • http://mamam.by/upload/File/file/vatukikurizo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1ca2ab3f9807dab666c914e4872c6c9b/tijojikixetagimapomorojoz.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8e0192f25---4030729272.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/63908050756.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b29e88103e38a8c1218906c998da65d3/55556802663.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbeagmfqarvu4lj9bolr8066c1/xigumukaj.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/854071117.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6da42ca31c6ba78b98cee1f6d99d48bb/70503053119.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158677a25b---80848644473.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/8440396369.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/gudawef.pdfIn PDF document text
    • http://inncredel.com/uploads/47875580990.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/663uorpvmejbifrqaasilcq70c/7513649034.pdfIn PDF document text
    • http://bociany.sk/media/file/27398603499.pdfIn PDF document text
    • 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 10476 bytes
SHA-256: c56b6a0b9bca229e167cdbf4fa05c6c1ebeb2869abfce0cbb19b0b6252aec5bb
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 18360 bytes
SHA-256: 7a5d235e9d654742bba8ada71466a3fb3505ffd56496b89622d26357032a890b

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