Malicious PDF — malware analysis report

Static analysis result for SHA-256 476288f18ecbfb75…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 14:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 623f9b5ee3c41e182aeacdd9ad890358 SHA-1: ebcd0d0b3b436d7951fd17c829b4ca03956db51e SHA-256: 476288f18ecbfb759c9ad3eb16a0eadb94dd6e9039193f2fcc43cac07278812e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious code. The presence of numerous links to potentially compromised WordPress sites and disposable hosting suggests a phishing or malware distribution campaign, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://westfallassociates.com/documents/file/popokixanituzaxixesasip.pdf In PDF document text
    • http://francescasciortino.it/userfiles/files/kufed.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/fisiwubobojegusololisixa.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/47837087414.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xametupixavitadafutudoxir.pdfIn PDF document text
    • https://parfumzone.ro/files/file/91745360400.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/bizug.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5715262356.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8d75a95f655193bae61cee82b3292818/zixetadoxakubokenogidive.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zedixelomizejaxowij.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/28369099850.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/99826902018.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3c5f23878---mesazadidogozituvifefak.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c23d0bde08---ferikaliratofedo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mofazij.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/wajakef.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1ai/files/file/devavaxu.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rilikujid.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/xuwej.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/minunavonejenabozetovidak.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210911033654.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lidelirijituwivesubo.pdfIn PDF document text
    • http://rococosofa.com/files/files/rawafuvepufuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+print+file+as+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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 10632 bytes
SHA-256: 5368bb077e4f04185ae666351f81400149048818269d6b16df4576306ea80705
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17540 bytes
SHA-256: 9892fb93e6b630c85302333b0f33ad7facf090b1cb467a2efec34fc86f05211f

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