Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7bfca7fe8108a8…

MALICIOUS

PDF

107.4 KB Created: 2021-07-14 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 22b173265c196eab42e81842369a4cb9 SHA-1: da8470e2f82f3576cd7803476718972235114506 SHA-256: 9f7bfca7fe8108a8632118615f3f226f22e70d011804270f2f8a6575f403042d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used for phishing attacks or to redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://pestresolution.pt/site/upload/file/52092001540.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/89b526093e35560818daebdc5bdddeb7/59293808528.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/djn1b9fsqo9os4s857tunuvb16/gogasexifojimaram.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/pigafosarika.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0s37aot2r3jrstgjpb1nltilp5/44365376671.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • https://datawire.gr/files/files/7980900458.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/bekawazibeberulawoz.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/80785008266.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-8/20210508112300453230.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e14dbba4d---katakirorogemofunabatu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/ledixunowa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078b730cfc95---230492273.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cceb671f---zigevipojulufop.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/sd4b4t43n6piiugaf0jugpc558/zosaluj.pdfIn PDF document text
    • https://viettrungson.com/media//Files/54022710593.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e3823ca---zawamukasaniwudifowutu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af4b2d2d196---69447842576.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/95375259835.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfddd298f3a---getuvanitexom.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/17760052152.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/838751054.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/34792906319.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/weduvenawora.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10983cc677---23111840182.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0295c273e---9882742631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=different+types+of+diplomacyPDF 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_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 10896 bytes
SHA-256: 8422608c69e41f04bcd7feb7627a7ca42f83f4983904544553984254e3d10399
font_01_sfnt_off000158ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EC 17744 bytes
SHA-256: 7d54f0526b323a76da4ba5e62eccd2a89a98727079358e1e4a1afa5e0ec0f77d
font_02_sfnt_off000186b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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