Malicious PDF — malware analysis report

Static analysis result for SHA-256 712ed43f23015554…

MALICIOUS

PDF

90.5 KB Created: 2021-07-22 11:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f791aa18369b1457014fd2b7b5e6d73 SHA-1: de81550db48b76bf73453a5f0df1df077f83033d SHA-256: 712ed43f2301555448576063543000937894aa7bbbaf20fbbacd5080319b060f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, disguised as courier tracking links, are designed to lure users to these malicious sites, likely for phishing or further malware delivery. No scripts were extracted, but the overall structure and URL targeting strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608762b7141ef---93478021545.pdf In PDF document text
    • https://sindonis.com/userfiles/file/40622711723.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/dabaceb589f77d9041f13ab15a2cf135/55910221820.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/zefudesexurujakokebowef.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/gudetupeketebuvemaditori.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/semiwupupizerujosimurow.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9752ef71dfabc602a3a80a18865eeef8/77356547344.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63995336871.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/radaluwixinenof.pdfIn PDF document text
    • http://humanlitech.com/files/files/kinanupasibipadip.pdfIn PDF document text
    • http://web68s.com/upload/files/53967558822.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/kewupimim.pdfIn PDF document text
    • http://rhondachem.com/d/files/nukezuletogadiriwifef.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bdl3egsdl6kbtfjtk72v7infnb/pebuxil.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/47262c0ecf5da622010b454ea9a89814/tuwanidopusivujuzas.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/bupoputumixobakupaxipego.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d2b90fb0---56311349237.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8472326da4---tekawok.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/54e6a10d6df890fae6096dc683ba3818/58519958876.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abec0016f---58455497726.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071abf19e803---59045446146.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/63657016008.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7o6u7v2r8hr4au6nmfj6mo3rf3/sibajev.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c4382ee3f779a25fa84426c4c4378d73/64768877048.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/19cfdf3b34775a82ea980ea958ab5029/nuxeperifufexu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nedepubaseluje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=professional+courier+tracking+numberPDF 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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 17096 bytes
SHA-256: dc1026fe266fb62ebee6fe9c19988d119ba6285f5def4afc908e7ec77f1f6f37
font_01_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 11012 bytes
SHA-256: f4a2cc50d3a59041fdf6b3be1e163475068f32ddc8a089dbbb5b4856d5c61d8d
font_02_sfnt_off00014331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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