Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff540fb0d182ef…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 08:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c4db731d61ceb9449257ae21b4a834c SHA-1: 683413a23891bfdc66a2a5be7fab93cef3635650 SHA-256: ddff540fb0d182ef12bdcc1990b1e8714ae8454688fd2f541570d8fc96d6b030
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis suggest a malicious link farm designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cottingham-group.com/cufiles/files/vedofatefofifisi.pdf In PDF document text
    • https://odontologosmalca.com/images/userfiles/file/21877564000.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bfcb5fc850a15c8bb793c01130d6b1eb/manarevawufevazuleg.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/maxedetifujeguvovabipuj.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xalalexorawugokapuwabixux.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147eaa02bdb5---gefura.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/8978500992.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/pozosovasowozuguterutaz.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/16755166987.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/kuwowuxesagezarix.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfd698286---46341380326.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/vudopuwidexapibovi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/puzimetirekawuzozimap.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16293368646.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5pc6j3lm2mnlc1o9500l0brvk4/tusevopererofoxorasovaj.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/87817393299.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/73494706480.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gamojizijusipozoseduv.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/9224688471.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/rogajiwokerulitex.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/pajefufamisasawigojudemu.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/57596204885.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/55a43064aa905313604dd9c96445d0b9/8654245488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=x3+nfc+android+11PDF 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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 18732 bytes
SHA-256: f055e7e7a561ec75f068173d56695a4294eeb67398e815c42c926c8e7cc60568
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10256 bytes
SHA-256: f433924e3487fa6aff60b84ac2f824547a59484cb44325dd57af4c4cda73922c
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1