Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc92e746ec3fd66…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 13:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5723d65c01b0264e92aa2de8801fbbad SHA-1: 76d2f323901cc3afe7bca8fc56520320a7dd3a1a SHA-256: 3cc92e746ec3fd6670a1758445e0463f52e8b7153d316d4959847eeb76c12c94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=gary+goldschneider+the+secret+language+of+birthdays+pdf PDF link annotation
    • http://sztarmedia.hu/_user/file/wewogalupojajuw.pdfIn PDF document text
    • https://avflash.nl/upload/files/28016071139.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f4ea57ac---najifuzumajawefewexupo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/67557499617.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/30898866486.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49980141210.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/81244602189.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/511093eb0cf9316980d6cb394661fbae/8708362889.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/fuxinosudi.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/17870123083.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sitafiregevatajezetava.pdfIn PDF document text
    • http://szm.hu/userfiles/file/noxowirujowowibog.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/tudabubajojuziwalu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d502981136---42185554231.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/71288381529.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/45206312372.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kokop.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a8c72aa1a---3551160130.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614449cac660b---51944343613.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/94733915188.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/vizobadimosonazamuxobulot.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/61499180712.pdfIn 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_off0000c2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A5 11292 bytes
SHA-256: c625a7e32c2733dc70fac021532f5e30f8fffff43a2d71fc213615321758e135
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 17112 bytes
SHA-256: 6923b2f11687f1aa5b9742e5eeefcd12da413bc6f9d44bd303843387113070d6
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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