Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d1e6df583f5e7f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6394403567e8ec51dd4139e9a34d6cc SHA-1: 6830f382134e79f2793e549b2248b32d23f5a82e SHA-256: f5d1e6df583f5e7f5d573d20702e0e9ec0eb51a4429756215bc5f20c30a484d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=android+snes+rom PDF link annotation
    • https://taperagi.com/contents/files/mefurijewakedilades.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/13210113214.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/43907712801.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/90531660315.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/bopajajob.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/toranetuwemugen.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/95799779857.pdfIn PDF document text
    • http://surtek.biz/image/files/20150405_054848.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dba59eb3---39387075914.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wujafadubuxak.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/junipesokinipukuxanoguwev.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d7402a6dfc42ed544c5b1b947bbcd263/newujo.pdfIn PDF document text
    • https://anjingliar.com/contents/files/pibogekebupi.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/lovobifejedowaruxoxisutok.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/95346884762.pdfIn PDF document text
    • http://lex.tj/img/file/99664581956.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903093052446997.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/pomozuxef.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/beleverun.pdfIn PDF document text
    • http://armanetti.com/images/84090534623.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/83283086261.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912062119045.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/42259657029.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/31242390986.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161364ff0675e8---wonomixalovaw.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210920_4891DAEDF339CE78.pdfIn PDF document text
    • https://olterus.net/contents/files/9902568763.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_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 20832 bytes
SHA-256: cf662abe4ff02a222f4c5064efc07915c0cccdcfb96be1ff0cb35f619919b4a2
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10084 bytes
SHA-256: d611d2380d3f9488c6ac9ee272f3ee387503943d088b20bcf4cba62541acae4b
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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