Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f360231f89620e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 23:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc658a18f70ba36ae1fced92c41d4296 SHA-1: d81533146128b3b99579aefcc0ef2cb929615d76 SHA-256: 09f360231f89620e99b4deca0bf463c868e2c01aefa4f9aea76ecf5dba61c0ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the heuristic firings and URL analysis confirm the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=morphological+evidence+examples PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b747599ccf0c066134a7502d232ab7e9/salokox.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/10793056900.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/55b48163a46993b00f7be79bd6fb2ddf/miwumeworev.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/ropujitebukumokivetugu.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/nizufobepawof.pdfIn PDF document text
    • https://educhina.mn/editor/files/labuxirorakamavegunujoti.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd921cc8e1---80682705300.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0223fd450b1746c2775e765c2a1d32cc/fomopabogob.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/powudikiwiginif.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3596abfcbb47cfbf630fa00046e61320/kipenomijelusesemidu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/runugazukum.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b613a64e60e---futewuboxosigokuj.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f609a71b90---54099698661.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de1885559---xifatow.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/99285763274.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/95c32391ff4c1769cd39034dc40d0579/pifegeju.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/13383574801.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2be2d37d8f6e65cccda8d7d3da029c7d/24578063468.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/84410839328.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bfb56127e---21457259740.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/tibamozivuvegelunewaxawub.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/13384349789.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/53026188369.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/venamezirewekuja.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/safalitejuratisopiliku.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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 19272 bytes
SHA-256: 2ee968d15e1022af981b18d1b692a9bdca188e70b6378793f22810e6e6f4c355
font_01_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 11024 bytes
SHA-256: b55e334537adfc65a606e042f97fc0db225ef756198e06d0da763d7c9347dee6

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