Malicious PDF — malware analysis report

Static analysis result for SHA-256 de52fd0dce91db0b…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 15:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e365723be4873ef6559842881c638478 SHA-1: ddd07560db127e32896c57e7cb9c3826c9c31276 SHA-256: de52fd0dce91db0bfb695b12add7477b038ba4d5004eb0b6d404b70cce8b74f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://saikekanglun.com/filespath/files/20210926202409.pdf In PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/fotejojojunuxarar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc9ada117---13775103687.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/razuzunibutat.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q1752a6smojgs3fqhrho6t1dq0/burazodefovavimatazuz.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/70160879589.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xunozizade.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/roviv.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/11364653036.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zezoda.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/d886d8b6181079fe28f4a3f3b74a57c2/tenidet.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea6b850c9---risenomuzega.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/wurolugopen.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/53184955513.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/73399247733.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fulirimuwexesaro.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/96639320481.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/53974927429.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140920b90a0c---82717562417.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/terofiwuzekowolomut.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5c0a9826ce87d4738babf79268dbbe09/miginefakoperuxukazar.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403ce31b753---rabowewajaxisumirasafadug.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/betuzofa.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/dofajumi.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/7423975713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=will+somers+the+tudorsPDF 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 16768 bytes
SHA-256: 2d589c2418a2db12ba151b720aafd574ab8435893e774b2a9f74253acf176ad8
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10340 bytes
SHA-256: 6c6d9672eb634befc6d67153ae02c8b660f4f802ae2e50fd65997f067ecf0ad5

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