Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9958d68950123f…

MALICIOUS

PDF

93.6 KB Created: 2021-09-06 02:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70011cba56360ba86363eb4f8b8c8d90 SHA-1: a72e23234d4c013681e8af23566282c3c69c258b SHA-256: fc9958d68950123f71a27dd9d08a70f5d242dab4a32d0bd5a812469ad8717360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing attempt. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tnt729iivqt7cibo866doi4prm/xefujite.pdf In PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/godopedevesi.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/xutim.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/fibanebufamiwid.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ecbb28d0---12203432860.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/62cd74b73f7674152e13cc6eee88682e/nomimomedakex.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8e3f641282ceef77ee2696f11acb8a68/rumedigeniwulapogobozilab.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/84956598540.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jewilagupojikewi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/47320567919.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/jisotabu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/10413e1c836ea9fe8bca95b007448d19/narakemixiwefiwejigerul.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd0683ee18---42704091257.pdfIn PDF document text
    • https://kimansion.com/uploads/file/foxosufemijol.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/40920993620.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/58343010748.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba655dd75a---nezivedopeb.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/firuxugekomarukuvajetutum.pdfIn PDF document text
    • https://tcremich.lu/files/files/88435564892.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1629048116.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/11513907530.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/48380294083.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3885078049---42431711226.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a26394572bf---60669044429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=active+directory+interview+questions+and+answers+l3+pdfPDF 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_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 11280 bytes
SHA-256: ef7c86c64f51cc7da0296d5cfbc77adf4fb5fff524d23a695c3743dc718b60ce
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 18220 bytes
SHA-256: 1372c8b9b3ff9a4fc15da417fafda82d3476acd8e650315a460be9d56cb53ac9
font_02_sfnt_off0001501d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1