Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06843071bb57bba…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ee7b7743797c3092269080479a2d585 SHA-1: 8f999921ecdab72c9e8a387fad152a6496ed2b55 SHA-256: e06843071bb57bba496648b846282847dd60b3a584fc6bae3f9c55fac88439ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised WordPress upload directories or disposable hosting. This indicates the file is likely a lure document designed to redirect users to malicious sites, potentially for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/s0ssi8p1ajvo58lpglj55ahpjd/9823036748.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4ca3ec50dac53bdcda1f872cdd84272d/52256261615.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/remebuzuj.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/14959478178.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/97732452536.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/46596984202.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8bda5385c23c8a8db92eda88a9203d81/580090485.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/46e1a6b920e5f67d268fc740426b39b6/53584854889.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/47397044958.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/dukorawepubofixelosituv.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd13388a60---zuzuzut.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ade85b67---dazigonasusezexomewori.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/88760746237.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2f7e3ah56bf928u5gkc4f9si87/52374183540.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7redoek2cm1nc2cl2g4kcjjsn6/7658003725.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5c9jt4d70bcc8778bh431fg6n8/68598778969.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/93847558014.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/girusemigojepotapeg.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/73b49d59240cdbca333f5fd1c76e6179/vifup.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bca47e359---15865453303.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/saguzixeguwozeg.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dd8396b8816---zarosifudubexatapim.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/noxunawawatil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=in+what+ways+was+the+election+of+1912+significantPDF 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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16296 bytes
SHA-256: f867bc0f2fc93d5bddec01ae67c31a439e84f59941f08f00dae36245acaabafb
font_01_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A7 11008 bytes
SHA-256: 1abee34fabde70a706986f91bbfd722db6c5706148703ca4b1ba727689e1c339

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