Malicious PDF — malware analysis report

Static analysis result for SHA-256 337f86b68be8ba58…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 12:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6537c870a3de78d8ec39da897cc29aef SHA-1: 73a8ae4e34aab01731b633aa8d1982acd1167a29 SHA-256: 337f86b68be8ba58fd891619cf38382716fbbd36224cab6fdf7fd67af7119532
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=kode+redeem+minecraft+java PDF link annotation
    • https://perfecthospitals.org/ckfinder/userfiles/files/81215182011.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/45039509075.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613988d56bece---gujaxiboxeruk.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/kugotozudewunemadalujeve.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/39249494296.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161375b9acca95---57405267458.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vadolizodito.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6b24901d---sotofafezegezudobo.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/26271558558.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/baxewomuxar.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/kudomiradopunuwo.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/rosejirefemabuv.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/tutibujoxuwegiwejesa.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/5214352920.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/wofamapukezifavon.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65086630483.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/46016718105.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/46981613126.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vezogox.pdfIn PDF document text
    • https://mar3ol.com/Files/files/22348029651.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5298c9fac7005632e1fa9fc9a3ef9ac4/xebaduzoludedu.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_off0000bb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 10612 bytes
SHA-256: d2c9f4f0d38f3ac0abedcc72f94ad055678450c7456e9585e0ba7d4ff9b8724a
font_02_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16664 bytes
SHA-256: da7385b4108d6a2a575901ed3d2369a3246b48dc6c5e35471c9b25840e7ace78

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