Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f80619eba6f8c39…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 18:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17056e46c938ca2e876c7dc7e5992413 SHA-1: bda42825c63eea1b7b73badabbbee3538f7cf15f SHA-256: 9f80619eba6f8c39dc8815d9188816771fe80d91d9795012551245932d8296ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

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://lacgl.org/upload/editor/file/84934603088.pdf In PDF document text
    • https://qkon.ca/images/file/woruviz.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bb0fb86e527b923a2e5e06bfd5679c59/82251435026.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1aa91904a5cf8bf8f62180b478a5463e/50019147750.pdfIn PDF document text
    • http://boldogelet.hu/media/45121548104.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/fozekaxofaseraxu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/80426312472.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dd7dbe6d81e2fcfced8633bb77dfd944/komixebegerufeje.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/momufazevejigupemi.pdfIn PDF document text
    • http://dominant.name/userfiles/file/fodixotisexuxinid.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5b4c3d78---tutomorunepebilabegid.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/raruvafajipukamudo.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/75494716766.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/xoxidekupamukuvomebugoje.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/zaridonuvevopor.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135b02fded6d---25874589950.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/72992188725.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210914072820.pdfIn PDF document text
    • https://akconta.com/uploads/files/lajobobo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/poturege.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xelegosetik.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613601ff42088---xuvafezonejatij.pdfIn PDF document text
    • http://belovosushi.ru/files/lafixuwiduvab.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8qc59ermp3ql6l31iqt25rhcfp/tamojuvatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=real+racing+apk+unlimited+moneyPDF 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 11040 bytes
SHA-256: 556b1d8ee5820ac4933b8ba5a9f2d1e98d91e878550dc839f5ec378c9f4b9342
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 17380 bytes
SHA-256: 01dfbdb3df3ca70892c2be4485322fec385d0f36b95c293907b10ad5ca02a211

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