Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a03d3800e9a698…

MALICIOUS

PDF

83.4 KB Created: 2021-07-27 17:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 87c0e2ce20d7f6573d7d638384c8ae5f SHA-1: 7a5eae5ee312696d54a0852103662b275ff691e4 SHA-256: e8a03d3800e9a6985da893f50e10aa082c173023b28c43a2d2b27fde78cc7318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b732745508f---fevodozusesusesa.pdf In PDF document text
    • https://aimhc.com/userfiles/file/28787148828.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/wujuvowezawopazodowupolaz.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/datuvebixifojazozasigosi.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/xatudokataniruxexud.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/disovovozapijevotajiviz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88f4e19a0---8421995632.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/65671377465.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/juvedoju.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xenewesejiwotesole.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ddde7214c25---32057719771.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/66770334525.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dce854c910f---84394077792.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/30i0kpp9oa16ter62kb6r5coof/13790387014.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098642bcc56e---16961992802.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c8fd6618cf6760b0d8bdc93270effc05/mafutanivukus.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/sodunij.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435da96f69---70164112740.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c288f59c857---84103893577.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/n5n5au2u1klblsi20o6ns6fsia/3153538492.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc34879b2d9---puvakakigaju.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/65906531158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=unlock+her+legs+pdfPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 17516 bytes
SHA-256: 75ce965d48b0d1cdbf15ce91ea5dc38436ddc87f54b39092bb857f5702ffe6eb
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 10648 bytes
SHA-256: 1d4e5b459a95ca3ad66fbd030fa0769c4704016d4929d6ac0ccb9aa3f3b29055
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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