Malicious PDF — malware analysis report

Static analysis result for SHA-256 515953ac1960edc1…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 01:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a2980fd2f1563854a913f34378bc506 SHA-1: 5cab9f624f57bb9e0d2b4a341ec1ae858e9e2dd1 SHA-256: 515953ac1960edc1a2210f12016e5c3d41d2c524e81625643705cb92fd0dfc2f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, making the primary attack pattern the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276f20d4aa---9598973141.pdf In PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/sevemozujagojazulon.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/82508848418.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c899351bec1759f92c484c5345105579/39737407200.pdfIn PDF document text
    • http://husplaza.hu/editor_up/kebuvaditipitipexetas.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71081902653.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1oncr9at4bh5apkn4cr4nrsev4/mosidoziwewonavu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5df775e6f2d152ea2a6682e80fb6c517/tuwaj.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/62189107889.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/92793259377.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/gabutuv.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/78751909978.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/fematawuferariboxusako.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/kisigetotigoku.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/97134328703.pdfIn PDF document text
    • https://uangraja.com/contents//files/takagulilugepexisutov.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8194cf0f2ce54b23636576a3b71aa66e/60555415933.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/10051269252.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ff34d002---seguzifojeberonolipegule.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/piguwe.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/90b2934fcfe0de7b5704a600bc584bc8/64323658089.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/8c8292f30f5093ccbce473409498a349/jinepikul.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h8s1m9tqpt1s62upuh5a5e80ir/tilivira.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/93956671964.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a11590d4957---takegerufupugafekenigimag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=image+segmentation+notes+pdfPDF 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_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 17476 bytes
SHA-256: 8ec05278d807df566ea3889f88777ba8ed9d962f10a0885bc6d3c39af6d5c691
font_01_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 10644 bytes
SHA-256: e0fca1f8ec25ad38628c308f6bf5a06e8b4276e6936bd67da381cdf07d5a224b
font_02_sfnt_off000151bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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