Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d44a3efef82bad…

MALICIOUS

PDF

88.7 KB Created: 2021-08-23 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77e3215eab4645a36e6284c9684ffd5a SHA-1: 9b9581b36dc748a97b7df2feef28387b34d56a7f SHA-256: e4d44a3efef82bad7bc00fba835db3077da5f857287ece536c5651cf6542f427
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document instructs the user to copy and paste content into a shell, a common technique to bypass initial security checks and execute commands. The presence of numerous external links, many hosted on compromised CMS platforms or disposable domains, further supports a malicious intent, likely to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://velkoobchod-man.eu/ckfinder/userfiles/files/kizefutezosi.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745ea849569---wafejesitagedofikurok.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dde88ec8e---86065388672.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/niakif006fjvtqnfl6c37jhcg6/pusomonipoxeg.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/rekisaxexi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ugrc2o32g32gu692p6rot2f74/2644521415.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/fosasanojox.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/9557867986.pdfIn PDF document text
    • http://lagrupacio.cat/file/78764675860.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ecfa6bb8---wifabose.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fokagiwiguwodiragasole.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/vokogababejitav.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b574360a---morerupafiwigenejalisa.pdfIn PDF document text
    • https://nexusmediation.nl/files/budenabuzetinutefebamel.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f9fc4b595d2b15b7195f17800df32115/vosenutapibeb.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/52515397080.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/42503395962.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/061e26e97c9f504fc5a616125390b717/zilotagodug.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jorejanuvut.pdfIn PDF document text
    • http://liyangah.com/Upload/file/72871016727.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pivowevasinog.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/88117496261.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098543d90f80---4809963129.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511190320.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/96904253204.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/9447704767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sultry+meaning+in+tagalogPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vulitakuwipinunekize.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10572 bytes
SHA-256: 0c9563aa517b88e84d20f6020bf54966f3739a84e63a2e504060004fe6e80ee0
font_02_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 17564 bytes
SHA-256: 53d44da8e9fbcc665a5f655f6065f36e26ece99f2db7eff76dfb456f695e7f3a
font_03_sfnt_off00013c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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