Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a3aaa963e912f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 02:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21bbff9f63291d8d20cfccbc12538979 SHA-1: a3d2ba7fc54b9beeef376bec669260339905e84e SHA-256: e54a3aaa963e912f48b91af1ae0956f49c845e377834b0184445cbfe04bcc7ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to potentially malicious sites or to manipulate search engine rankings. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

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 https://mfdesign.hu/files/file/biputurekig.pdf In PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/37032263770.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/95103189123.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffae48feaa---nuwiwiberedo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/josovewop.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/dudebivun.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/76968842117.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dab0d08b---bajukezuziwovapubaman.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838e5b8c9a3---saregapiwasujeza.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tivilus.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/20497574543.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/71782ff370f1fe22a89058a3500ca032/1870532321.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xagamome.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kebolidukofexutu.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/12855059124.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/gixoduradegosetux.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/dijepaw.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tejojotudoderuni.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5210c8eaf20d946f7a426c008c7af24c/58777094055.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/55725841645.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2srs1p39q0hou1piiuih1g0m9i/serugidubuzibefepigifu.pdfIn PDF document text
    • http://skrn.cz/pic/file/74813647763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dog+care+training+collar+troubleshootingPDF 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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 10748 bytes
SHA-256: 5a4c5b7f2a3d6ef0e920a130dc33c2f9cb52edd0e80cbe8e21587ee01ff90d85
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 16448 bytes
SHA-256: 34b444b8338aff0dbb045b1226476d83f85193c38eb6831657f5206cf13ad117

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