Malicious PDF — malware analysis report

Static analysis result for SHA-256 de43f4542d77e8c9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f978dd6c7c541fc7106fa2df9e54f901 SHA-1: bac0f734245360b7438bc518e2df9c78a8877bc7 SHA-256: de43f4542d77e8c90f477efb942194ab25f4bfe855cfc76de76898bf7e0bd4f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kartelabasligi.com/images_upload/files/kujomoxo.pdf In PDF document text
    • http://hzyixiangchem.com/upload/files/17916667249.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/60ab20d3f0fcaa09628ecd43aeb67012/55199640877.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/80643093983.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nugolezemafugopap.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/rutikutanunususabup.pdfIn PDF document text
    • http://biomehl.com/images/content/files/36857152964.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/79684647976.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tesojujajusovesasimafuxax.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/godevowisorefunoralu.pdfIn PDF document text
    • http://hidropro.hu/upload/gelijesilogugosevoxo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/21105215542.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/50201782427.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/dekebirabukufeturib.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73059591735.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141e39cec3f4---xuromelaxakimefaxiwarorum.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145923c7c7f5---samab.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/vegawotojubab.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/42764514521.pdfIn PDF document text
    • http://computerdoki.hu/user/file/44777435565.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630857529.pdfIn PDF document text
    • http://zaiger.ru/img/file/57313026277.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/25251758949.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/befirotinibefozikapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+watch+canelo+vs+saundersPDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10616 bytes
SHA-256: c576170a0be2eefcb2a1bc14c6389314fc9cd94e60553d679c76e8bafd27861a
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 18152 bytes
SHA-256: d52fa51814cfc9eae85056dcedabc552e8a5eb47e342735c9947654e70dc6006

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