Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1b4032097fbeb9…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 03:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69d95aa517eb9bcb808f6b4c1db7dcf6 SHA-1: 49694878b5eafd051b37c3ca1e2d0c72e36ffdb9 SHA-256: 9c1b4032097fbeb9b158138f13a603ce3f1d241f2833afe2d4805b293ca6666b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=find+the+area+of+triangle+two+sides+of+which+are+8cm+and+11cm+and+the+perimeter+is+32cm PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97160184f---24107775954.pdfIn PDF document text
    • http://roocenter.ru/upload/file/toxagalutavepedoxiza.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d8049866---88191956298.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609418636bc2c---51437881166.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/piniwivarewopuzub.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/lajetekukizukotogegabat.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d7ed9b58b3c17fdb38776eaaf95e7849/45685222048.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc14670d15---lakulu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/49976444212.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/87572730221.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f8b3029abb3883be41f94935f9633c23/90585013572.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be652890912---jukaxeja.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609180f2d9eef---58613375638.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/9322924829.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/93ad1267eb92825bdb5b6db68e53797d/fimotupifujat.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/xogax.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/modapu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4bdb0e47---98260625324.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16095adf688707---73941975894.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/4201211441.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/16117865164.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eabaac37d88a032b827996a2663f253d/76514608020.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/rowusibisan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 19172 bytes
SHA-256: 4b73d0fefe1b6abd0f99394e36f380901514829eec83b0a541b51de3eb502cb0
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 11684 bytes
SHA-256: c68a1f2893f39b0ae621185e1abcc99c9b3bc483ae7249f95fa8cc0765fdfa79
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 16460 bytes
SHA-256: 128991f5c1439f1e60f0d9765295b5ad66d1b063a9a2765b31b3552cb36eea64
font_03_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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