Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e45e760667c432…

MALICIOUS

PDF

75.4 KB Created: 2021-08-04 05:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 264ec242ad0189b3395a6344e327c5a2 SHA-1: 5700c62ea11c9b2a5eb04eee40a6941e91613650 SHA-256: 37e45e760667c432496a998e8e4c80d61d89057982681b95db53bc83b7366133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://arzhosting.com/calisma2/files/uploads/ferotuxamuziniramosadilib.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/88430338989.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39246318121.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983d51dcb95---10488154660.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/u708m2ee53fdmiq9ae7flv49o5/56142167808.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a559dc9e582---xinisilu.pdfIn PDF document text
    • http://aplus.to/userfiles/file/zinifoba.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/xagalidukuzosuwumuluroga.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d77e98c834a61f11deacada45e9f1807/77609303157.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1ebee1ed---77248779164.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/02caf44e4c8077ce514f323837432f0d/66017064040.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/juzajokuvomafab.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/44814821387.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/35301836316.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lufelu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/38fcefe479feea1af9a5871ec1c0430b/zexediwarilagewifoxota.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ae2083f8d4bc98fba9e7af859067d512/31170012149.pdfIn PDF document text
    • http://parfumland.sk/upl/toturepuxafejev.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r6tk1lkva269jonqm79574t067/40573276891.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6e7966bb---jetodozutokira.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4308c0d509---tufonesisuzuzusixobim.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/nuresevevojusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=okyanus+yay%C4%B1nlar%C4%B1+7.+s%C4%B1n%C4%B1f+deneme+s%C4%B1nav%C4%B1+%C3%A7%C3%B6zPDF link annotation
    • 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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 18000 bytes
SHA-256: 20ae4682dfac0d57ac63e77051a71e1633476bffa2d48dd71dbc4722d8e2e75a
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 11236 bytes
SHA-256: b5d0e255e3be78b78e7e61bd449f9dd607bc7ea909f62d00aab0808ae77cd620
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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