Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc742b1baf2d287…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 05:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07312ddd19365a6c49f646da260d0366 SHA-1: 74cc01ca6afa2f94550fe33f0fc3040616c78d77 SHA-256: efc742b1baf2d287c2862fb32ef069a7953dcbbd6a09d691f7e07b215f6a7b38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate the PDF is a link farm hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

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 https://chcial.ru/uplcv?utm_term=marcy+mwm+990+assembly+manual PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612daf862a2d8---30552251426.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b08079f5463a3d2890ba50968c897a26/11197061365.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/fasemiwerubiwutumuwik.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mopederavozak.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/tanuxudunowisuxajimilep.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/sukarajevelomafotorilako.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077df45ad1c8---43423913864.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/75498446535.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/224159a87ef55531c15f9213aad6b39b/43732189194.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/so82mbj9f75bm2b1hh3opreha2/zozomixamapujevigomumepo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd89e05dc42---62327672240.pdfIn PDF document text
    • http://potlista.com/file/files/43586997323.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/11219862725.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9a3000283a3db9fc693df07fa42c6ef2/nunefalesil.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/74113892048.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/54051476708.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/kuliziwu.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/xijatuzoninutu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/6135313291.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l1r1etrarm89t1arrh2qe7ltjv/63117467984.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/56033348755.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/13276811168.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2916940dc129439dcff48af8801aceab/talimuvesifojota.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e653e8282---fosanival.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_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 19224 bytes
SHA-256: a875dc420e283a875de15b43813635cee6366f9a9e3b87dd73ec61542d49bb13
font_01_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 10804 bytes
SHA-256: 04591ce48e6042056601c4fc44b7f90a14315ed0230025df6e03563a8dbdb9e5
font_02_sfnt_off000143ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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