Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1778ed8ba7cd186…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 07:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf890006c5e23835bddb06becb72c338 SHA-1: 2a0c3a2afd92c20e49b372881b7168a8962866f7 SHA-256: f1778ed8ba7cd186c8ad9f001fd00c95abd7b58d06fca8dc3cf7eac9d3f7c81c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link to a compromised WordPress upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/76750393198.pdf In PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903095126773280.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/4856779047.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/vojubevawaxerikedudo.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109062152433929.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/wufodimenuxi.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/85434622089.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/27923066171.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/vababubetase.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109020049438252.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dffc678f8a9ee9a2b9ba082cca8f1061/30657965488.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/63706842684.pdfIn PDF document text
    • http://gewald.ru/content/Files/xamuv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe825c038c---nojudimipamulafus.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/70413099099.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/2187343824.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6117427207.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/vodadu.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/22178839164.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77798740096.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/tedagutububosiworugimuwiw.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/69902562436.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/21c1aa47c03a5796a1329aca76c223f8/robebazo.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/fabusof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mini+militia+2017+apk+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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10668 bytes
SHA-256: 836a9219ac0a4038f30352e734c1343e72d6452564773b6dc79a3a39064d51db
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 18896 bytes
SHA-256: 42e35aaeb156e3b758e7c8391922eef71d421caa3ec86f6bf06b8b95fa6daa9c