Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e6e5aafdb2f90…

MALICIOUS

PDF

85.3 KB Created: 2021-08-06 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1962502d79730535c78556a3172355c SHA-1: 2bee3c21ecc046152df6affc26bd3d733238396c SHA-256: fc7e6e5aafdb2f90815ec0f570da306c3abc4d58211aab049a0fb8110c43923c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous PDF files hosted on compromised CMS uploads, suggesting a phishing or SEO poisoning campaign. The document body is unreadable, but the presence of multiple external links on potentially compromised domains strongly suggests a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://kjphotocon.org/data/userfiles/files/39156122922.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd61c1f8b4---74644052083.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tamusadaserexapaj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oi7nr87fp5lm0ov2ga53hr4j21/pejuvexogogelewexedasozin.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/joranadukipogabad.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/26422197274.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xepexesibalepugebojered.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb602b5158---66066030503.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dbb9112e---namepi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610005eb7964f---13090596601.pdfIn PDF document text
    • http://coluer.ir/documents/file/wevaxubuxezopilunasisiveg.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d8b2dde5---modapigojubolotavefano.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/nadusukirajewapibasolij.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ddac0d1eb0b0d25966dc554a4742267/14803671636.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee176f41dd---buleveliv.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80161e543e---38243437179.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fiboxozemezugusafiw.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b45e9a6712fa422a535fc7667f4c1e14/tegajivav.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/fisibibafiruzufimilabek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073218adf5ce---8106440912.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3d5ig7s5idfqll67r1gjkbfet5/mofuxuvalefiboliveke.pdfIn PDF document text
    • http://askort.pl/Upload/file/44308518270.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/91696217352.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12476b6430---tasevibosozuvoxir.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/vipululoxatiguwijig.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/81175042759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=allocation+and+apportionment+of+overheads+problemsPDF 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 17716 bytes
SHA-256: 232a9428f5f3a90fe9b6c255fb5d52174d824591a509803df9d5c77be7a25913
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 11072 bytes
SHA-256: ff72ab65d1265e4c423bfe651352b36778d8bc3d0fef02f5b9dbf45744391f92

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