Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdda7a0667ba1ae…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 01:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56e38a2ff9235e5a70fc8c7ba989f75f SHA-1: 4ad5144bf035b83d4ab8263e6275f6cde97044ce SHA-256: 8fdda7a0667ba1ae642973ab5674556b1fb088860479553713f2d7c3a46e5be6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The document also hosts numerous links to other PDF files, many of which are hosted on compromised WordPress sites, suggesting a link farm or distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d604a190bc---wijufivuzudug.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d23209ece---kiberepo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jaweditaj.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/50053243902.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/salakiletigudexovadumuwi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nuburetuk.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ji76ht7amsop8ndp52cm037fq1/80728183363.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/jivafi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b5139cfedd8806fb3047f9109923f05e/47329344048.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/16574773322.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e447c01030---bulakigojutipezewid.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/nijofatu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/jinuzisusifu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c030518c---vuximevutesuzigefezakax.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/830a147195ed74de79aa9a1c1f1c4ba5/79718600948.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/iihtmbjkfvpgb8o3ujaapupl4r/jiliwowe.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/53945871460.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/98290608872.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/tuberosuwuxixetijizuzi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/24122963385.pdfIn PDF document text
    • http://centronegozi.com/public/lejewudibiwakopejutisas.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/91065976412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+merge+jpg+files+into+one+pdf+filePDF 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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10888 bytes
SHA-256: 1afd3b8cbf996dea24da54f0b217b7b23c03e46fdddde6f39a93b4748b52483c
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 17872 bytes
SHA-256: 5227ca716e099cb71ebc57f3135bf24b2ba16731547068a3c32ecde41a5b120e
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.