Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9db75b8d99445f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 12:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b91c68d9849dd6a34a6ec3122f780c2 SHA-1: 17ecfb16f0703fbfe0b1979e8b7b5dfcada4ec52 SHA-256: 7a9db75b8d99445ffa60284a7f3dc3386196424b192aef8e0fe59cf19b359103
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell. This is a common technique to trick users into running malicious commands, likely to download and execute a second-stage payload. The document also contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g8iipv46le7v5mf841a5vh2nsj/busalivebu.pdf In PDF document text
    • http://scales-center.com/shop/fck_file/file/porizigixokotokerukix.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea2919516---76389911723.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483141f9a9---tawivefulaxuv.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3c3c6ee---vijivefavawek.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/lixesuxek.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021617134232291.pdfIn PDF document text
    • http://allasclub.com/campannas/file/28179270065.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b32adb3ac45ecbfebca844e0d1a452f/tusotimupagerirupipakuni.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/vo082ov4u9dp965ktk9bekm4pl/kiruwol.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/rotuvotem.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/62021c1838979f923b4b73768dec3a7f/44723904961.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddda1446fb---47491112202.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10548652383.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e22febe74c4638019a3909c10b4df10d/zipukonidagoku.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/mutufisugeludu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7783612c4---xidarijixujonovabobiri.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/13600634000.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4fbbf17404e0646ad7ba6a890306e999/ranilinupenizebeladafut.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/32081996035.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/vimemilira.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2hct0p3n9io9drv63kgl4jlv33/lafatirudimosedi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sezuruletamujufenebixumuj.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/vubuleveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+doc+to+pdf+linuxPDF 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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 10580 bytes
SHA-256: 1af4ea0d17c4c247dc7a243790c25d8d5558e514d001607d9459b0d92f467a31
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 17684 bytes
SHA-256: 8f484f761e11b5ab829cfedc65e784bba1d2a571a62dddaaf5923448abf8b827

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