Malicious PDF — malware analysis report

Static analysis result for SHA-256 79efde366ad94b25…

MALICIOUS

PDF

91.0 KB Created: 2021-09-15 18:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfd0a4d7d0f1dfd5052cf2179b753a62 SHA-1: 18dea86f54c74d11d26ac8cad1600b1732db0589 SHA-256: 79efde366ad94b256e0181753c188d2f8abdb1104ebc5a4fb8166839ecfc052d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF that contains a lure to execute commands via the clipboard, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. This suggests an attempt to trick the user into running malicious code, likely to download a secondary payload. The presence of multiple URLs, some pointing to compromised CMS uploads, further supports a malicious intent, potentially related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2u0vuurobu6vo1krioqotlp3ti/18339100908.pdf In PDF document text
    • http://abwingssuffolk2.com/uploads/files/diruresotuzazenox.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630528304.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xosotabupewafalapanop.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139642182580---dedimovafujarokig.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68396252921.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/30556995415.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/wogoloroxinonu.pdfIn PDF document text
    • https://intersat.lv/files/file/vobamatisatozafofusemize.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614129b748b50---monisolokegufa.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/2349583981.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109102104561553.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/wotidisevuwijulijuwevuto.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/pegovakigag.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/xifubawikipalu.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gagazituwetekebon.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/6868036786.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kekutigedagoja.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210909225418718616bhc57vgl2j24.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/fugasafuporusene.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/85643148245.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/13389269857.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/13149252900.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/81478521658.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/budakodipomotaxododuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+temp+video+recoveryPDF 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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17648 bytes
SHA-256: b24b82ba7a08069fd4dbeb2883fa5796236817afe974208a22722d40ec5cb5f4
font_01_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001469a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 10460 bytes
SHA-256: 49a04514a88b7eba467ff17a9f21931e2ca7df7c97999e53c9f5d23fe048ff68