Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9241fc27e1b3ade…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 18:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0062f67b471192420387b3fb51ce1b17 SHA-1: e5abd92c433435f8c10ecd088cc907baa09ef57c SHA-256: d9241fc27e1b3adedbd1b801db6847d4a28b879b4f0d60a713af66c2bd017858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, several of which point to compromised CMS uploads or disposable hosting, indicating a likely attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://spain-ex.com/images/blog/file/85148104457.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/19ad110f17e2547a5ec7943499a763b9/2528647682.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/zejinovadenera.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/xidanodibenebavuji.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/xeseto.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/sexotepefuvo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/87843566476.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/fivedemimelunuligirifav.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/sevawinemigekefo.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gosibazilajeluj.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mowinolefasunevot.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/rizifep.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/84725274753.pdfIn PDF document text
    • http://getem.eu/files/file/batokigavogigojejij.pdfIn PDF document text
    • http://mayjack.com/upload/files/makilagiturutuguluj.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vrhihoi41gv6glkh4h36gotqki/dazurorewamilubakeba.pdfIn PDF document text
    • https://primer-spb.ru/files/files/55167219248.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sujerikexulase.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/negunes.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/60361264848.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425086b2032---35570093027.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/74642803427.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/damitiwifobikiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+history+of+atomic+structure+article+questions+answersPDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 11012 bytes
SHA-256: 32f3655e28aeee6fde7e821ba1938116797cdb4906f63bd95f5b1131f009bd8c
font_02_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16356 bytes
SHA-256: 48fdcce8f977039614b34b5c4fc26778cf0efae6982ef4f7ce6d264dda1eab97

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