Malicious PDF — malware analysis report

Static analysis result for SHA-256 299c4fc79cf68679…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 04:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4a244c5db7deec69646581109ed75ee1 SHA-1: 9a7f44b1a929edb53fa0dd631c22011cbcb3899a SHA-256: 299c4fc79cf68679ca5d67a033a4d09739c544446b933ca6d6019c214811d31d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or link farms. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/wenenipazoraruvaratufu.pdf In PDF document text
    • https://beautyyaurient.com/editor_upload/file/52794592555.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///15627169363.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2198dc546ebed4978b0db6bc0eafa4a9/36311268353.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kv1g65krb5fohfkl2gdfl0e1g3/kulupudofejiraz.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3rt4u5od5gnfqds826csl06vq6/70557531222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cdeb56856---nanoti.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/mezaxanezopilababu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062317241880.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/48533756640.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071994e3702d---vusubogunomesezidapafu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/29b0fc367f33460b514dd686ee8278c4/96084558164.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8d0ad3df9---kutusazanora.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081878b1ebb7---63082975625.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/biduw.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d2c90c87---22425803110.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/dd929c1f6983864bfc4c839720d8bee3/sedinusujeb.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/rkcjcrfse5tncasain5evitg68/35192256170.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4d4c916fc384a8ce836f70f8b78cf4f6/bigunomuwekefibavovuj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2838cd3a22---2741608928.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/23e969ed1d57b867e74f2046d9ee1608/buramiliwerunitok.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bb542ec19---gotuvoripenomuxogesukaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=business+statistics+a+first+course+5th+edition+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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10960 bytes
SHA-256: 1e83874b0cf6e5a4437398cf941f9af9ea2206b0313acb7791e5639f7c3ab3d1
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16672 bytes
SHA-256: 93e1ca60bd38710d95c62da2606514621ed5a84a4d0cdbb01b04839b4b57d688