Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0655af291db713e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 08:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de563e96b00bb352ea73416a4e371917 SHA-1: 211d1b4db1e00762217faad6ef62d64a8b8145f2 SHA-256: d0655af291db713ef9c82c19ea7b76008cd0a101057b61710a8e1e899c69b125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pdf+foxit+reader+in+word+umwandeln PDF link annotation
    • http://copy2d.com/ftp/image/file/99355584871.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/306b5d50da0e6d159adaeb11a501436f/76611427069.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8434ba4701949a54c04670a51d7f00ee/19009303676.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/dr9l8d5bi0f6v0nlvl4qlkidcl/96193477747.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/burimukupuviwoporivu.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/77567437813.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/jomizaretegudufaj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ee93dc671f3---nuzanupepagufa.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105131426187657.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/15225486311.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/reralotarakivil.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b8065e0fba14447205adf45b9e07234b/selifijixobukeguki.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/tasonu.pdfIn PDF document text
    • https://nadamasristorante.it/file/63096622776.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bedopibesisenuvanu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f7acb5a1429b3cfc168ce12dabb10450/nirunarinidumuwe.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/fenataxetogamej.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/nadawimiwumikasosolo.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/10258018326.pdfIn PDF document text
    • http://imoroz.by/upload/file/53810866346.pdfIn PDF document text
    • https://faprosid.com/file/kafopoxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf58c76baa---30085780147.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/26cuc591gg56n0l2v6k2val9ib/tuxexakadonakini.pdfIn PDF document text
    • http://119pump.net/d/files/30262399179.pdfIn PDF document text
    • 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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 17996 bytes
SHA-256: 47a92c7f7ebdfe93018ebc09ddf6553f7be9203328c1a4a1a89796e497385a31
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 10636 bytes
SHA-256: 745d95ab5ff1f7fe03a993ce652e8c5a2a0a94a8f2df4bc9eff7d66751344c76