Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5ad6c05782874…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 22:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f795d16977b182d68c68c142d4c9ad7 SHA-1: faf606bcd31592ed549cdfe3a8dbbb293c1c9f94 SHA-256: 8bc5ad6c05782874331276acd640b8172a0f13b235c00a561038a7db2e9589df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external PDFs hosted on compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The presence of these links suggests an attempt to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e2f131d592996ac8ef1a57d0f9b1f69f/99833240752.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/dimuzafenegakuwexona.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca982a4a5b---todebamuguxen.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/fulomu.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/pilurutenafubafafupob.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/91fb1a8a6b42da3d361772413b801135/rukifopewusuvev.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/oclh79n9t0fhg6dkne24qd4ni9/ritafesebeg.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/79881393238.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vabafabarabamutetopunit.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c85f8791f6a0644ca95cdf9af6c55bf2/4426733253.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/nibipifivusopawe.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/60740cbb3af4d1628938340319d092f8/98666521429.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/525d5a957370250ea199231e368c354f/77283273673.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/45654406846.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/97413089509.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ebefc1e469b0e88c43a2075f9bccf9a/87402711446.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d18542713bc---44080277.pdfIn PDF document text
    • https://epiphanych.com/images/file/98999812831.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/noxovotegojugona.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2da7c2c3b916f48887e36171b1714b51/37931906276.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080507b68305---23756459588.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f2d0ee20---4795061442.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tugekema.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d15d88f021d9e4e34f05b32569e6e68f/resebusuzulovizifetasaxa.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/71043049018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=9+of+cups+yes+or+noPDF 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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 10360 bytes
SHA-256: 48bfd8dfe992abc938aa49dc56ab9bc736ceae0a3fcbefb29ce2832efd355c05
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 17984 bytes
SHA-256: d34faa542e2c00bc1bb7663e212b2de77748283a095d172714cbf52936a801a0

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