Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cacc3d22b5766c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 373a155ba9065efe344af2546028bbdf SHA-1: 46730cdf8a879034421f07a681ac71f71d572947 SHA-256: 42cacc3d22b5766c524e25488d1452c3ae2e0fcceb72d6aa03c83bf285097e43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://wangguanhardware.com/userfiles/file/pedovidebenawafima.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0kbvlspqujd0mnfm313ptgt6uj/51793681045.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/wavuwogonofoteg.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/bojuzivinajidasab.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/desupewir.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7a6a723c---jimavapabidudamufexakamo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161245049e0814---denunepit.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4dfad026a1d83441283e33432068637/xiveberozigavove.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fe840c9dfed679fa6e3f1663e7af3ad3/44654462195.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vewujobepawo.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/fedawose.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/xeweluxafuvogigowuvexojul.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/37169013464.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7296f3dd7bf4a5610dc60eca02f05e5/51170138483.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sogadowuvolaruxevam.pdfIn PDF document text
    • https://ms01bet.com/contents//files/girawoloxigu.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/15194097309.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15714275106.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/49531228110.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1299ccd01e1efb3ffe3b3a57cab0600e/1966824666.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/pewez.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/51996326220.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64171629174.pdfIn PDF document text
    • http://findusafranchise.com/files/files/fosefokepese.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4fb47d452---xanesuru.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/99217656276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=i+wish+all+the+best+to+you+and+your+familyPDF 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_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 11012 bytes
SHA-256: 22fd69192f4e3b6fba6c1e47b0190ff7fd0b61247ae444c547e165783c367cd1
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 17424 bytes
SHA-256: 98a4e697537ca56a5e7e90f142e4a0873317ab11fcfc8318328d4a858acdc74a

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