Malicious PDF — malware analysis report

Static analysis result for SHA-256 914749877e6380e4…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 07:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ae075cba2d07ec878e51b2f0669c1ed SHA-1: 34a15d5ead6fe426eb959a5ca086446db4d08804 SHA-256: 914749877e6380e43cd808b9aa8069ad57be863bcafdf8d1dc0b4368614c144f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or redirection scheme. The heuristic 'SE_CALLBACK_LURE' indicates a phishing or tech-support scam pattern, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/riiptjm3dnnqd6r5o39bfa7l2d/pefederolirukuwedub.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/43637941916.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2kht8ndeqflqbu2r5uur69c2po/46166971567.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/kopefuvageturidexipi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5vba102dtnrf3o7bjk5ju02p7l/21933982454.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zegewebujefenonurunij.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8c271434f---fexaluzikafuma.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdf3ae2a1---lelidarisujafus.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/motal.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90a86e45433e712f51290eb9ac502b4c/3445634812.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/gumuzowowajaxafotuxafo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jamenonetinenob.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/525d00796644b7e5fa11ce4bc263f0b3/tugenajavabebixuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nnu3r4dv6dls8og19sugbott15/47522271116.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9bf3b22e---kifeteram.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a283c06230---85838184375.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ee8acef0---30636311037.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zagedosevof.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d508dca2---fugalapuzexagogexepazamo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/bizozaw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc8f0ee910fa04aef33a55f1935515ea/zafujajepi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/kupeliwepuvutovet.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/47376427502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=larimer+county+inmate+searchPDF 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://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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17188 bytes
SHA-256: 88ae68ea21f03a86918f5b7ace3efc125c5e4d415e79c669ed0b5d6bf4b0d4a0
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 10620 bytes
SHA-256: eb93aec2a7b744ffb126410f82d39de18e12bcd2778f91d55ad47c502638bb15

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