Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85cfcd336037ede…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 14:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecb36a8cb6b5dd8145cc5835edad7dd3 SHA-1: 2e4aae18ed047cff63a48e1e4c40168553d895d9 SHA-256: d85cfcd336037edefd372cb02f2039dc2beb7e921096db99624824d1c0943329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that form a link farm, a common technique for distributing phishing lures or redirecting to malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://exlite.it/ckfinder/userfiles/files/vireri.pdf In PDF document text
    • http://bioaec.com/userfiles/files/pofubepazobijowov.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/65067080081.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133549d36f49---49293559981.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa7a55252---26794667773.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/fajokijezoxud.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/5705526584.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/5071017702.pdfIn PDF document text
    • http://shopabrang.com/images/files/zevufejadodugafipu.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/misukep.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/97020157815.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/21129848448.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zogibipolorapirif.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/wexaxegativunalakunopov.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/14976743481.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/14562845536.pdfIn PDF document text
    • http://sdds.be/userfiles/file/33578278727.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/vepejidifakef.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/rifoxilibigu.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/28369536625.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/misisovagubutibaponu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ae0a4518---gugivawodesadaruti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+lightning+thief+pdf+downloadPDF 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_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 17556 bytes
SHA-256: a8005d64690b531d91818aba8f2b5a2c71fbdb01ae0b3f5914292c899ba4d27e
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10560 bytes
SHA-256: b3c75561d523823d262d078284d829e9990beedead51951eda1dfc2052595833
font_02_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1