Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec65a1008167ebe1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 15:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6edb50f38588076d0c3bbaf77aa41d66 SHA-1: 441f34b7897190841bc08743ec011de69392e236 SHA-256: ec65a1008167ebe1e1aa01f124050e6c4ee012406008767e8be101ba1519da36
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://catamma.ru/uplcv?utm_term=play+store+not+working PDF link annotation
    • https://octvads.site/js/ckfinder/userfiles/files/mezobeluzesusesereseb.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/41415258932.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/kezajomalakakidop.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109040921524481.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/4671580547.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467d4e135de---defegi.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/gajomozotededekukutad.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/pujebewitobojuriwekudi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/zojelulikopulasusebuwerud.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b7559866a66c43fc539a8e4ab0d1d179/rorivabezezibaxozida.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/besuxafufopifebozul.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/xizuvaxutepefo.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/56325987180.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16148ef9acb51e---78784399676.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/dadisume.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/22916688530.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/raxagewoxibu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/gezeguregoteb.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/18680492654.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/36661323453.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf1e5ea9---sozikovelemeki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 17964 bytes
SHA-256: f153ccc2116b223da2eae8e807c26171bd3af3cd47ae59159c9cff702cdb761b
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 10576 bytes
SHA-256: 0a72473093c429c8357090decc41562df0fcda065046ca3d25d2111a7189e357

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