Malicious PDF — malware analysis report

Static analysis result for SHA-256 064776b60eefdb41…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 09:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b088c86ba331972c02f418c3416c430a SHA-1: 6c935667cef28310e75542dc7816187f50aa3ca1 SHA-256: 064776b60eefdb41128e78e9607a2f0a4ccbaa6b645dd559e8d6ebc04fc1bf63
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting and contains a lure for clipboard command execution. The document's content, though heavily obfuscated, suggests an attempt to trick the user into executing commands, likely to download a secondary payload. The presence of multiple URLs, some hosted on compromised CMS platforms, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lysfyyy.com/upload/files/74076791741.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50182991061.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/revaveboxozalopogadubo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/50349727327.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/79511831468.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/faluzopukuxo.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/38197279929.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7fe8038a---fezoxefejisaroka.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/90196752575.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/zewux.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/zogaxi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fef90bd3---2639718682.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333dd10b628---jerebefaraminaseru.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/42659274238.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/75271798712.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/ladojed.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/44506870326.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/rozuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+run+apk+files+on+pcPDF 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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10744 bytes
SHA-256: 168554a96e9685e30a8d3dfe93f786603ac6c94c6264087e31ad5f1827513dfb
font_02_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 17720 bytes
SHA-256: c312878b47bb4016e53633831c28b5fe0254e1019df288f12b34f9ae8cfd8264