Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ef815e2699402f…

MALICIOUS

PDF

102.3 KB Created: 2021-07-07 08:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1f84ae70019a4e7e0e59efa6bae416d0 SHA-1: cbff6644e1d6f9f67da78e18d123a853b049161f SHA-256: 26ef815e2699402f6e6ce8788a492bd593f52b00669b6f08368bacedd7220ea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=how+to+stay+long+during+intercourse+pdf PDF link annotation
    • http://allnatureint.com/userfiles/file/87593517101.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062317431946.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06ec29609---xubopadinitelewu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/34626624280.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210518034352.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-9/20210509032259205708.pdfIn PDF document text
    • http://gptools.net/userfiles/file/14758086858.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74271115631.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/20976999676.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/60k49is2r303rdpqq9o0c2eq86/17760196075.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2cec12e794383c393b2c4d5e2a812e88/wuvoz.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87dd5a2ed---damezonozaj.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ea390daeb---wuzavibudowukolorav.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/28427683623.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/ladufenubizamibezu.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210614175334_ughgpi.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/66997233750.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/87b60c129646142a756fcfe63674e8c3/93820895733.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/vowixabijulilufaxude.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/79131983058.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50ea5f8de---vulewot.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609698e37aafe---12188467529.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_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14339 11088 bytes
SHA-256: e42cade8246ff5e89a8cb2f7c79b2e5487f6473b1885f972dd0c63d5c4aa151e
font_02_sfnt_off00015d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0A 18728 bytes
SHA-256: 913dc7df00ef337af85ca710f199665dc94f50a7f1e9dc81a1df29b6c03b696f

Open this report in the interactive analyzer, or submit your own file for analysis.