Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee94f1cff82d4d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 10:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f86438c2fed78a1b2665641e15800733 SHA-1: bc2e191b23635aaeef822a07c9a91446a604ae28 SHA-256: c6ee94f1cff82d4dad04ca21d12cfaafa3d09626291a1a854b0726faf09ae1cb
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a likely phishing or malware distribution attempt. The presence of a QR code lure and callback phishing indicators further supports a social engineering attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cellesekorea.com/ckupload/files/12751333794.pdf In PDF document text
    • http://autofactory-jin.com/js/upload/files/88320767490.pdfIn PDF document text
    • https://masihpt1.com/contents/files/firifig.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/renosirafobonevinesuxevew.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/tiwezozi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/60757384123815eaaacb8c81bd30a4e6/vovakenuwebanavera.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/losusolarigakaw.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/49574726538.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/fedudikurub.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/50698254297.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/lolatav.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/fubewekibane.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/75424672675.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f153780009---jozuxutufejavopabosativo.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/22160105543.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/64912916729.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2599678281.pdfIn PDF document text
    • https://peterdegendt.be/file/85179386496.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bopilekodokufuvan.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/piviwogenesopas.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/83075283267.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/89037154526.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fizaru.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219122248114243.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613570a04452d---65215613692.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/80871274068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=icons+whatsapp+downloadPDF 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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 10324 bytes
SHA-256: 9516549a7c962b439eae79471e6650e0626d6ff5e213177a1cf314ecd64d428a
font_01_sfnt_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16944 bytes
SHA-256: af70a7a46eeb62c3561354f3c222140b8cdfa73a8df942dfed4ea1f7c3884e61

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