Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a5b01b6bbd207e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 01:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7a747beaa23d2ded8c78d4bb3c30a285 SHA-1: cdfd448d90045ecc0eefca3996f76f4ebf6336f6 SHA-256: 59a5b01b6bbd207e92302b6678353feb51b3fbb22657c1ed39e21359e474bf62
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of multiple links and the use of UTM parameters suggest an attempt at SEO manipulation or directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://babamoleskine.com/files/file/wivexovomo.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbed5f5ed---rafezoraxo.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/malodi.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fbc835cec3e03f9d82a7621b33e9690d/40427000176.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6d83aa20---91347703864.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/msndprdrsc7nvnf1v4uvf54v40/24419677824.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7jbr5he8t9ko4osn8fqflhp969/geloniza.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5e7a271ed9cc753aa58b8d93b93eab9f/11229002554.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/nexiredonudij.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0ab7495a---nifuvobema.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca7b6c4d3---48317122053.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810efdc8973---38621504340.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/70539188986.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b988c80c2---zawilekimopaxubifunote.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24a44738c51c09b30213c3f9fb0a8fec/fukadumev.pdfIn PDF document text
    • http://langmypham.com/luutru/files/fusex.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9c1302a---80067836724.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4680b0d309940d2c27a0e2aa387c3cd1/vitowevowinole.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/repagisiraregedezitajori.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8143a245b---mazamob.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/838a62b29c0cca93a2ed7c3cb6968bba/refujulonolawipemozavobo.pdfIn PDF document text
    • http://deauville.ru/files/file/71514363496.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/19648317561.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8d90e7ce64b2432898ddd3b67df4eaf9/newepumugazesujat.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720f4edf3d6---90549378685.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/pikelibowusoxosimomuwowok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+tp+to+your+last+death+in+minecraftPDF 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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 17820 bytes
SHA-256: 8fcd52491c921589ca20048e101699547b234f921679da76c4fd1670722c1ab6
font_02_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 11176 bytes
SHA-256: d29796fd1ba118b48cdc54cad19f7bbdb84c42ae90d7dc26d521b44fa4025b49