Malicious PDF — malware analysis report

Static analysis result for SHA-256 089c19eb4eb328e9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 11:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e83df171c0f5b95e8e2f8311a3ca649f SHA-1: 3acfbf94d95a48b2bc1bbdd0fb8b6865a2fe223e SHA-256: 089c19eb4eb328e9afe4cc115e1c3134c851e8496ab2690ab4555b4ee061190a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. The presence of a link farm and the use of compromised CMS upload functionality indicate an attempt to disguise malicious links and evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.jacenter.org/js/ckfinder/userfiles/files/mexodena.pdf In PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/36397018840.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wobelenijat.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/90627757721.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa5cdcbd6---kivaribefak.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/31134424149.pdfIn PDF document text
    • http://chieucoingason.vn/files/68997774400.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/bagigikizozawilujakobuz.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/dewuve.pdfIn PDF document text
    • http://progetec.org/userfiles/files/77144020213.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/budafet.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/goxudofilomake.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/jekefogogemogomebutu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140993016e34---69039743867.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc5b4cbe---24587956288.pdfIn PDF document text
    • http://ctm.it/userfiles/file/88111451907.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/57709871200.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/38099228661.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • https://mashura.co/userfiles/files/4215086638.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xofoke.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/26431071628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=frp+file+download+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 18548 bytes
SHA-256: 4f70c189fdf9f4f2b1c7e17021f1aced44a69e867693587691d8c9ee561d8720
font_01_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1