Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b727c3d4e8a1f11…

MALICIOUS

PDF

86.8 KB Created: 2021-08-31 02:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c140fab050fcd3e8dc3df35419148a64 SHA-1: 4a9dc15d162b31797af3acc3a6650c07fd484b78 SHA-256: 4b727c3d4e8a1f1199e2d3c180a2842fb4e9091791477d89f42a47777b90bb62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://all-pass.com/folder/editor/file/45005378341.pdf In PDF document text
    • http://bioident.pl/photos_fck/file/pijuledovujotowo.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/93270662718.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8t1ijpjqtk2jslqf2vjutq30cc/79358699547.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b070a93171e---fisazeziso.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0bf1e7af---fetetufitajezevazujamux.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/73d83qtcgdtqfpm9htf7j4gc8g/98981977116.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/mejivusopenave.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/dijipudatupaluxaz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/110a486babb0cf49e1b59bf9404d11f8/10077194339.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/992fe123b0084e49f59b89ac745e577f/rikaduf.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/82253348056.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2e8b845f6a2edcacdad83bf38d1bab96/kigozoviroxusibawax.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/79410203174.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6p723c4akf58td8gh3v4q2jd04/lizesiguvif.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789222ba1---koladibutokola.pdfIn PDF document text
    • https://soechi.net/userfiles/file/tibopumapuxutenifomonulul.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/588131dece9dcc734d2da806fd662f4c/bimexejakak.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/xiwijetobapulufafe.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/supokanamekigi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kobul.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd465ba66f---bixopapogegadexokin.pdfIn PDF document text
    • https://telenovella-bg.com/files/rawemadejekitunelonawisul.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/80165089353.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/14091182294.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/da62a1df6a4d8c968bf5e7da505d7f88/8158755798.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210604143130121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=perpendicular+definition+physicsPDF 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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 10932 bytes
SHA-256: e76ae1a683b384d6c7a095c255219744167ba26b20714c28a07453d46c6c32ed
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 17100 bytes
SHA-256: bc29f0e25e8dd12bf80815b7f1714bccc7254b6f25b614f7875df4c01da5dc95
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1