Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ec534ed0438fb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 22:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a5252f5dbb7ad7df11e3b366b2c876c SHA-1: 8c85644ee5dfa26cdfdfae7ecb5304a50eb0f5bc SHA-256: 4e7ec534ed0438fb5bc2932d2e91c7a1c90a80ba8ade9ba5086b7b594c012382
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. This suggests an attempt to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b4d861d7d6e7e4c1cb9d45ce73db32c9/mivivizazef.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/u18glv82h50ph7sm6fvhv27nh8/53969063591.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/643b70306c1b00e63af479449e920eb5/nedozirinixubukovubi.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/49432499360.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/dabokubumufebekunufifepit.pdfIn PDF document text
    • http://a-pluset.com/userfiles/rebajitoxilame.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/90869191982.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29b140a4f---68142938903.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mepod.pdfIn PDF document text
    • http://ashioke.com/images/library/File/dobogozenewolaj.pdfIn PDF document text
    • http://apcmagon.com/userfiles/norus.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h692vnqc1129q0bnvmg3g3bbj0/85194791751.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608761758fbba---97613695641.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/57133798400.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b795f15c---73069126788.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7f270a1e---lawegusegubar.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fegumirasawotado.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077891963255---faronenit.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8512b9e95---89299783802.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b9dbe527a640b302dcee1316a71cebdd/9174046017.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/lizukanutapobelusalov.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71704ab4cc---2905303408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=web+designing+course+syllabus+pdfPDF link annotation
    • https://lapdonline.org/file/guzifuwixefoluxalamo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 11044 bytes
SHA-256: 7a54031024b74234fc4d1ada76fa5bc95d31d7aaa237dd4c2a82c6b0e336e20e
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 17080 bytes
SHA-256: 8777dffa61df7deb6b309adc0bcd08614dc77770ba98c1d36577c69a626ca518

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