Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b90de2ac6c486…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 09:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5195eee934220cef91f37f027b0e7aed SHA-1: 1e8614c303bc0bb1e518c1ead7bf7e04c5174305 SHA-256: 903b90de2ac6c48687743b46210be4044c0a4ca335561bf22017f999997c433f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple links pointing to potentially compromised domains and disposable hosting. The heuristics indicate a link farm designed to distribute malware, with ClamAV detecting it as a phishing trojan. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://quatang3t.com/upload/files/18874916008.pdf In PDF document text
    • http://servmed.net/userfiles/file/22792695760.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/40633818256.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52516999484.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ec4f756ec87def14e1c942d5a331b219/56361357779.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/97175405692.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/medakaneg.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/85394673272.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vedawipinajikigu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b6cd8be24facaae8b1d5379b8b3720af/33974719526.pdfIn PDF document text
    • http://nprofit.hk/userfiles/82580750200.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8da49880aff4bfd60b118d366350e2a9/topig.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8i30daq805l011ck11qqe3ksk7/7392627676.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fotuwisuxivil.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3f41f2cb---47446631719.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2sq0n84179jrhbh85t9tdlh32q/9790360695.pdfIn PDF document text
    • https://memoservicesrl.it/file/rabejemozivuper.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080501049206---tidisepabatam.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/94618490864.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/valerirovewin.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bcd80343---64691019996.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072216494473499.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/8452015312.pdfIn PDF document text
    • https://istanajp2.com/contents/files/50355429638.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/jilorusubagunuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jorgensen+miter+saw+64005+manualPDF 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_off0000b84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 11132 bytes
SHA-256: 9bca4a1b606754ac7f989a1e22e49c754e81f758709de14a9272a1bd4ad9ff65
font_02_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17184 bytes
SHA-256: 0eddf9b1ba481d32e91261d4254a0646c16b5f9c921bc12aa247120587b155ec