Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a41b1e559308bcf…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 00:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a42a3eb3ca2091e112c1dcca0698359 SHA-1: 2dbb76fb5ffb09d6e250953ea5d14fb491b475da SHA-256: 2a41b1e559308bcfac82bbd8352b3b2f33d870fdb039ca198a8310f884a7cbeb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5998c5e2---latamef.pdf In PDF document text
    • http://aktifbant.com/resimler/files/21760389150.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210913144618725.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/dijepipunutimumisalepopav.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/66599995371.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/lizelutinorodinamol.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8f22050---wuziforuziropegepur.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/31201673516.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hu0s57294bkcn8ocnssil3c2n/bafedopugavove.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909195727632852.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/52765550896.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/90368837476.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kulelodumibowonetap.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/navesikejap.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78577568450.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///11983957102.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/badewiri.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zelodosafupukatowosatirev.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/mefukudebenavajedejugabon.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/70032347418.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29034844653.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb88e0002e---56783528326.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/30427013130.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a14493596---97134887364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mrna+codon+sequence+chartPDF 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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 16824 bytes
SHA-256: af4af482f5fd13bc2f06d63729de1b92b1bce0f00e596c3f6099f18beb54f2b1
font_02_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10568 bytes
SHA-256: 64f1609430b9d971bd0950cc0a393ea1b6a571416e7ad6a6e76ae1b117516273