Malicious PDF — malware analysis report

Static analysis result for SHA-256 efab15e0e0efebd5…

MALICIOUS

PDF

85.0 KB Created: 2021-07-10 07:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3650ff1ce984a3b1bc7f9ff8d599c135 SHA-1: 3466ef40252ecd0066b154796bfaae9de935d837 SHA-256: efab15e0e0efebd5fe456ed7f09a5630023f6681bb458f406cadf246b8be5d85
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 functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the structure suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/75169ecf3f0ede8949fca10292e0b039/91152351109.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/48e32542743315614ab4f871f9d49aa5/vibeledu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de744ee9fabe782245af68066b09b6e2/90288343202.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9e59abbaacde087b2df00b2106afc627/70814789877.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e12cb6a86a1---sovakitoguxabixi.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/19146512990.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/33400758627.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/c6qu6fh01ggo7cg1lvp5brbdr3/5831491667.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/71821848485.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/kudivuw.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/12475145268.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/gopinu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2a8b38de43530acadc07d68e9d8d49b3/17383017040.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/332f1b674c043876d113bac2a96a9762/gibosovezawu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4c7f0daed8e62e230708090adf8ce/juposotozubelivajuka.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/zilunojemeguleromu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/vowogefan.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46addbeb---99387560288.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d8a9de9f---rodumobejoxuzava.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jorivoxopamijufekoli.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdac9c28c---nagerutotukikimo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abff90169da---40423823577.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607de14ea67f1---rurosewivumelumexejapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=active+and+passive+immunotherapyPDF link annotation
    • http://www.who.int/mediacentre/factsheets/fs362/en/,2.McKhannIn 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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 10992 bytes
SHA-256: da622e745d829bc94b5113331d3042e65c91eca0f424ec637ffb2803c57ee605
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 17376 bytes
SHA-256: 8984cb0da1b939571240b9e13f31e998deca7e713e1736de2c64cb76c33d72f6
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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