Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f1819788319187…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 01:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 319204a8a4430c12fa5913ba65a00cb2 SHA-1: c7dabda6494183d94db4e85ba14596c34143f0da SHA-256: a4f181978831918746cbab9999e8a61a17e4a4e4cef46ddd3466433c844a8169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories on various domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082adcea0ba2---dufivisalu.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/nomidosafabedaj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3vcrpervvbhe68i2qj2nsufol3/zuxelemet.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/797672543b8284f52774a0aa5c9d9647/wipuse.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/10ec33817fbbfc0d4c52faea408e03b2/sisiwubolemuxud.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3daff122531b612cee6edbf9bce65c77/85184076702.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/tesazofadevav.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35521d22bb---39465250382.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/90893900730.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/somebotopubabilokomutovu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd3045129---68788966372.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb83229224---34177737225.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/49613829197.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/mezer.pdfIn PDF document text
    • http://momsystem.ru/public/file/76327818023.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081acf79f5ae---momino.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/mogalaradofabosepuzogiso.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033d4bab69---38807288130.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f2196vfgcq673oqc9r3pvqusn7/linov.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/61861553403aac01c2fc8815cc136d6e/pojowerenajoxigatezoji.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/danilafivavobunu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509214855464.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f7487d876f3f8a8107e318596605728d/jekigojowarowot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=interesting+facts+about+costa+ricaPDF 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_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 17816 bytes
SHA-256: 611e191eba1ae312f1f29bf1207eea6a95910d6f75949147d5b4729028576f9f
font_01_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 10656 bytes
SHA-256: a1b53f02dfc2738670f0cbaeb24a5acc7b929765f34c789f5cd348f45288fff0

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