Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c1f31350399470…

MALICIOUS

PDF

84.9 KB Created: 2021-08-04 12:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 864092b0881305c95c8ab87d857c3eb6 SHA-1: e1fedb8aaea89ddea3add7aa482f6204fb2dff23 SHA-256: 65c1f3135039947095b12ad4c7141a49598ceb1cd293a35cbef5b8a32494d516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/99scu4arqb1t1h4lhnuprlsokb/14579466314.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/68accbfd81f965ab21eb9073e0721d37/8710520242.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/55277027532.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0b96534e55c86becb563f5ba98218992/lufimamaxokemusejimezada.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/92564584341.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wisutetaruroreb.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/rezema.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e56f6b439bdcac801a490763edcb8f3/27401032677.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3607732cd546c06a39617045e4a28004/xewedugowitazulolidepof.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/najikinizu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/74207923703.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6326da6e---92468201505.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/mosisupami.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/bezatafuxunaniwezebamid.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094de0a13cd2---kanolenukewovodivuniliviv.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8581ad9320b4315dc5b78a612b3d2442/71216441091.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086954e0dc4c---tugopifizibekafisufesole.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/3592352795.pdfIn PDF document text
    • http://livestocktool.com/d/files/zenixalagozisegi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921f08cff17---31582597346.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/bizew.pdfIn PDF document text
    • http://www.toptehnik.si/images/83867030233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+power+of+everyday+missionaries+pdf+freePDF 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10848 bytes
SHA-256: 658da3c9100fe3e87327a73b3df59ba748cc90bd7d6f404ae33973465dd0a819
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 17000 bytes
SHA-256: b702d193cfca06e15d71a4c5188b06c5a53f19bc02d1f8a5d2257204986c2915

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