Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9bcba1730cdd1f…

MALICIOUS

PDF

91.6 KB Created: 2021-08-08 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5021b0c9f36123fe746f1d2894879ca SHA-1: 54728ffd0bf9edf3f4e48337d3f206136e1d1398 SHA-256: 8d9bcba1730cdd1f752e72535c9deac332a7472893a99eb5c4bd00ea0a5432c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features numerous links to external PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code, likely to download additional payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c8ed11323c69ed8759df2bac4bd97b44/dabobuputavi.pdf In PDF document text
    • https://keongracun.org/contents//files/11499185264.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/redolazuluxuzusofi.pdfIn PDF document text
    • http://unityproductions.com/upload/files/14551993141.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/88800496300.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/44030972052.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a9e12327e6d3d222b439625fc210bc5/tekomamemepijatevebepokum.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63027324e3---xuxubobiri.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d187a29b43eba6769f13634bb78261b4/fizurepesuxolumanurixekol.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///zumegunazafig.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/45198173130.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6n51qupmfndvlj49fsrvu0clpv/3907014170.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2860d1882306a7d492488c6440721754/gezixupexavozisowujibomup.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10e36eaeaf19744c8010fb7391005d00/35998268238.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/niledeviz.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/41266153133.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xaruxuwedowozekomur.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/834e824524a57307a2e9f563b43fa713/51780802371.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080824474386.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tizukigogiremulupajabiget.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71a9006b1---81607981547.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eff1c8f344e---kagobetufaziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=why+is+the+crown+of+my+head+flatPDF 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_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 10932 bytes
SHA-256: 314b82c46ac848c64a3c2122e0b8efcabbea36bd007b713107e7925875674ac5
font_02_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 19060 bytes
SHA-256: d41545f37630af11106e10ba341983fde048b749d2ce6216140e295d47467eae

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