Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed62d4b1c9827ec…

MALICIOUS

PDF

96.0 KB Created: 2021-08-06 02:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5703482b3b3f53d9c3cd57dc91a5f390 SHA-1: 207f0d12cee41dbbb195a37458deeef8d4995f75 SHA-256: 8ed62d4b1c9827ec16aabfb7a042435b9ad2499f6e62c77d1b4eba0e545271be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085964169cf9---bavuri.pdf In PDF document text
    • https://by-express.com/upfiles/editor/files/27132154573.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1647e1b5---14945571749.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf2ac2a66---23264167984.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/lofegugejupix.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/28807934816.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eebc593478---8909389486.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nekumivolagifo.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/5527329266.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/pitupezunomolex.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pulogituxabugexivoxazibod.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079ded20d181---62794653424.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef06bcde4---84283430994.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a6501a83ab0---10412974127.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/95500579292.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/57846352133.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a6b573a0a09e2a5e38ebba8f408b9301/dolexoledidife.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o5psarg34g6oin86md80345p65/57062434420.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/gokinutejazubowubejew.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882b435df8a---98560475814.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46fca4608---70188085478.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612e95b3673ea3718d6a337037ecab19/woxumijovar.pdfIn PDF document text
    • http://floraplant.gr/FCKeditor/userimages/file/fizunikufa.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/zibakuguguvobebugizuj.pdfIn PDF document text
    • http://sushi-belovo.ru/files/51117807809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ring+video+doorbell+pro+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_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 18264 bytes
SHA-256: 70adc43e7b4d6793ae11e70323d0edb79045189c9293f8174a12184c888fe0a1
font_02_sfnt_off000158e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E1 10496 bytes
SHA-256: 3e28393386c6e690ced2d65038552fabb3bd85bb43230c190ec57df05a664941

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