Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a93cf22d303ef5…

MALICIOUS

PDF

95.0 KB Created: 2021-09-06 20:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d719890cea30f28fe6b4d62c5a57de5a SHA-1: 04641bfc60fffdf00950de1576cb5e1da975b003 SHA-256: f2a93cf22d303ef562f6c1e57a9e9db46fc1aae646c6ed9e174111c60e25901d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.diplomat2014.ru/ckfinder/userfiles/files/4855413593.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/gomamubowapasivu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d5941876da---62228185724.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16097189caae5c---muzasowumoturegugis.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4459cb17783f6443dbbe227feb1dd6f3/35847911803.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f988fe04647---98485191451.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9efe99fe8---devamesuxifekasisofe.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/kogimixifoxi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbbc7d97e---24125274776.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vesikixab.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/1314606107.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd038ce81---46677930484.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/wagaxelaposidu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c660a4441---40200199396.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/2128177451.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/411a4521568f15a2889cc725157200d6/68196998431.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/mukigomunoxemojikak.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7c4fe29b8e9c3131cf3a124281585ee7/65462929676.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/fijixivexesuli.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/28576510034.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tavekajigiwe.pdfIn PDF document text
    • http://w-mill.jp/images/file/80414758008.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f1685ba0a3c4374738492ba126db1a62/fekezuzofitode.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/57bfc04106f909f4c334db465fad9e5f/fijagibarobunejefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boska+komedia+dante+alighieri+pdfPDF 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_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 21628 bytes
SHA-256: 7462a32e0250056b4671a414db8d44f6eabf6f47d60820bb4c89e6f60e8d4b0b
font_01_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 11088 bytes
SHA-256: 5b68b3cd19cae1fba1ce076091e8282eb4e6590a5a0ff6d5b17f13eb1a119256
font_02_sfnt_off0001569d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1