Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e73e3cc441c8c47…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 15:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2ef3195a7444084702f293425105cba SHA-1: a6637ef003102887aac203f9304b133ba606e23c SHA-256: 5e73e3cc441c8c473580f253337810c868397b07134f19398ee1fdbba74c7836
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to the malicious URLs found in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vibanghanoi.com/uploads/files/tojorewasuwolavi.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecc04b20f---kepijarimewegoxujogew.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/75878378140.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/rugugabipugebupebopobogu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/935450530.pdfIn PDF document text
    • http://salt17.com/userfiles/files/32652479390.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/505d4348caea6e2e6ce849d66f8b0434/40372321525.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/49268411631.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/51531725836.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/mefonuwemudo.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vupexezukogaxoto.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86391a570---99499420894.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/fovanagimojagepapi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd0a9369---sujarejuradi.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/gidotumugudafadisezumi.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/jalitazatagiterug.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/wukizetobuxelem.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/tilomigigitosakaniwew.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d997v7ubfqskf4elfd3a7a0eo6/jadavikewujeturi.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/9006445030.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/laluj.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/rolopeginubawixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+i+mirror+my+android+phone+to+my+tvPDF 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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 10656 bytes
SHA-256: 0343a892285e7ec9340f9c99641b103d476b1d2f70e138fca767531bedbdb103
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 18536 bytes
SHA-256: 5b88e4bf63517e45243d674a2521d91f65609d3d84f8d28c93ef75d57b4f8be3

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