Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b19da95aa2b1f2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 20:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc5b268653f3c1ad40b0c7951dd764c3 SHA-1: 4300937f90d3cbd78298efb34c148061789ce1cd SHA-256: f1b19da95aa2b1f2773b7ffcc2f282192c22a50ce4c01e70cb7d0536a1e54d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the presence of PDF_URI and embedded URLs suggests an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/90135062047.pdf In PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/22639449696.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/xokuzax.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1104bc14777566c4dc9beadfc00c252c/73351439976.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c784136465---poponivagi.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/pafinakudesemajuzutibeki.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a578223d2f2---surunibegupapedepe.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/46767809663.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fodawefuwodomokufesinobar.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04f3552bd2---72841459089.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4a8bef854990f5f4bdf6e0ab23dbcac0/fimosevozole.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/julozaluwoluxenuvot.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/85161733753.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160795c45a779c---11716318024.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a7f23dc76d77dbff632e63242c146ce1/nopomugiwowu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/vefigoxupimaroxifo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ecfae1da7---gikanilenunutasak.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631c6b4677---mupetiwugi.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/pewetivejewunoko.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d6702e8db5e5528fb30c0cf311217af1/tedekaxidanetogosi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/27798170095.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/borefilubilegufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=self+management+for+actors+bonnie+gillespie+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ce13f4bf078f03abe8ead3a6d3b2c63/53362262968.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 17972 bytes
SHA-256: 15e73efc590208185e5b79439545de02248a113ff901ed95082799a6abac936f
font_01_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 11176 bytes
SHA-256: bfc7d2d65e81517babc4765d9603f3303a2d4f6c14b97a1bde36a164415acef9

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