Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3356a9a51f2bf91…

MALICIOUS

PDF

111.9 KB Created: 2021-07-27 16:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d831fc9579bc7ab975cd4ee7067f69e SHA-1: 2594584bc39f1c78d6830e2a7edaad62003c8304 SHA-256: f3356a9a51f2bf91fc64b93e7804f010f494afe68ea298cee01b0c9521e87868
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/midiguzavozuruneginigas.pdf In PDF document text
    • http://cafegreenwichvillage.com/uploads/files/67696978317.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/32438127313.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/taganuzefotixisubutin.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0a9878d0---29716381285.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fff08fa11---73206691876.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/3854477943.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e286834c1---vonokelagokusedogivuvesuz.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/xiboruzodawonejin.pdfIn PDF document text
    • https://luminex.pl/upload/file/62108574888.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/28e1c6e05e4d3156f72ea9be17fbc246/20360942253.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/7740052994.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0ac7954a86eb9007f06225e80d35a38c/26405330905.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/kusotavevogosigavajus.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c2156f3185d83b699b63fb0d13cbafa/lodivisavuforobu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c79e0296cb60454214685692e3a10177/46915395115.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4164f90aaf2841434a4d1890537e635d/pafivuxajiv.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a456a3f24f---xobupedelowodobaxuwuxe.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833c9758450---49241159444.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ajk4lf3tsshms4i2kt504ut0mf/soxojudotiluzuxesimi.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/628b7e28ab80b37a592a7c08ea7dca1b/48314654539.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/3710056490.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4650630b---zumiwetitenojidimuzuzemib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+often+do+i+clean+my+septic+tankPDF 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_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 10964 bytes
SHA-256: 3d73042a9d56f12b409f71f0428dc9364ca96d0a3f03400d2d5a01a8a23a047e
font_01_sfnt_off0001698e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A0 17768 bytes
SHA-256: 875c8d09c7844760d1c5f9a8de5db502fe85a1b06d1836c97ca9bacab542f47f

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