Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6c657ca022ee27…

MALICIOUS

PDF

157.6 KB Created: 2021-07-02 09:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7acb665db6f9aa21c234320968a946c7 SHA-1: 18c0076260048a3965e1623b7c5c5267e8b5042d SHA-256: 0a6c657ca022ee2752003ec781a1ec1a2447f02cd14a8e80da18f1bab32bc716
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. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm or phishing campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://oniceh.ru/uplcv?utm_term=whitaker%27s+world+of+facts+2020+pdf+download PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/73ee299321e48e4d729e6be3411b0e88/55312586701.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/towus.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/71059992033.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9835bd57---7423014074.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/1990375701.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/45ebffbfffdc3faa6917d35056c0f545/31215487581.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/47877187324.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5f6e70f0b708e8214e0ad5633a0fc4e9/zirasugetanefateza.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d449e189139d6f2ff4a1d654bf60ba64/61592387867.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9cacd758d---93419840781.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/66846868834.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54c1adab8---dajotebepajewida.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/vinaxunagu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mhpu41pt468e1piheptbtfd1u5/bovisezixovumulunatodune.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/6092049227.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/88a8a87440f143534792bcf5acafdd5e/60289173248.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///kopuwi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/julana.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f852e9081c007fc550a29a1c55357e3f/2568624922.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2483632716---tizebiwoboxepugo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf5b49974---21057440209.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c58096b0---zupinimijuraxaru.pdfIn PDF document text
    • http://93564497.com/userfiles/tekowukusufareluxitusi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/906lduektbsoc3h23nkoepk296/62901865995.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/81473037779.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/17684814367.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_off00020325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20325 11164 bytes
SHA-256: c9786daab8c522303088d37600fce8720d19af86293bbb8311700b26bc006bf6
font_01_sfnt_off00021d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D51 19272 bytes
SHA-256: bd6c61ec6be9637a3728243d3713ca6ff1f8ee6bdd4716ff94f304a947f28600
font_02_sfnt_off00025043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1