Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbf0b49afba7770…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 23:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb7cf581bfc8b3d6ede7888f519a578e SHA-1: 9ae6892d5352810139c2e456f6754a3bc7a7f879 SHA-256: ecbf0b49afba777056a8a83be709c0268008ecac550890e66630b63d9ac1be91
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://archism.ru/uplcv?utm_term=sat+math+1+practice+test+pdf PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932b745fd4---zizejeluvarubinebo.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/786062933.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094227556dce---37343387011.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210804_1E4B485D40AC656F.pdfIn PDF document text
    • http://palami.by/images/file/weboxewovuzetozut.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/56259581835.pdfIn PDF document text
    • https://ubranni.com/uploader/files/52236892525.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/zapesenixixatenejogeku.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc37f0590---69869940717.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/femidelugumub.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tigafivezemupub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9954bd859---56849153913.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24b5aaaf5d428f5ef25ff4d5945dd35a/11293005998.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcfbe108d---ligeziretiv.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/18780194854.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8792c9051561827ea3ce2e661881d32/luzedip.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160905e8650e94---31060564830.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612920d6f195f---62757523331.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/xisupawu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/kepezuw.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e45954d543---33642030150.pdfIn PDF document text
    • https://xigmatek.com/upload/files/59138166132.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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 17856 bytes
SHA-256: 7c7f5a16f2ce5e9b6637717559b75583e3d8aa2af39224383fc74cccdac925d5
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 10744 bytes
SHA-256: 3960410b8740bd240f1914f41250cf2b86cf83130cefc0262699b21009a5d85a

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