Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1c4cf39c2395e9…

MALICIOUS

PDF

91.5 KB Created: 2021-05-06 23:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c3384bb66cdd65a9987d925a7fa74e7b SHA-1: 9866a2c7d692c5a6a1878dce334daa0589ae9279 SHA-256: 7a1c4cf39c2395e90736392edd42c042019fa615700a36d7315879feab9a2d0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous external URIs and link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e28231934d5aaa80989a861805455b90/74662324003.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/dd5459c915fd91338f16ec3d575b4659/37927916117.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/73ba71c0199ddc5a7200ee4a0e7816b7/64601035982.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855df4e358a---votagudizejaruke.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/6460b1e12cfd4590f3a8c3ef1ab2a562/34475727090.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fb4d7a3e---vifokepuvelijusinosogavov.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ea30934b---gefeseminibux.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc833e140---35602436593.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/254463c1f71025c45c438353b2ba8caf/vubamemu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed43055c3---80904834664.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088294858b17---lorodazutofoluviwe.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9387e4daa0cdd8a5e424e6f656c5ed4e/kukevifozezofot.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e0cae6d2b516074fb5f8189876f0a922/wogepegepafitoraj.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff8e2939b---temetitorixep.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0e0ac2d1---36263019796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=insight+ias+daily+editorial+answer+writingPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 7256 bytes
SHA-256: 0176682df35152242f767be8c799d440d5db0b8407ea9554e22a41623066d4cb
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 5216 bytes
SHA-256: bad59fffdbc662c19d66f3bd5519bfed4ff23c98aa745ad13829ae6abd33a694
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 2044 bytes
SHA-256: dedd9ef44456abfe44c7d977340348cf6e06f093193479021ef22f3fda36509b
font_03_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 11396 bytes
SHA-256: 45919fd5962aab777ddd064c76d07c081be1e59e8e49c252444f6771a57122b6
font_04_sfnt_off00015c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 4428 bytes
SHA-256: 241b793503c140300186d63bd8b6446cca5554ad6fa2dbea534579740b2b9ff8

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