Malicious PDF — malware analysis report

Static analysis result for SHA-256 9111a7936a77eb96…

MALICIOUS

PDF

88.8 KB Created: 2021-10-06 12:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d277191e7e79f2f0f679f2feef3fb3b4 SHA-1: 19905c38d637068ef714c91c18654120905bc97b SHA-256: 9111a7936a77eb965fec91c3bd5da55daf21be87db1fdf2294f89fcfdac67080
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable domains, indicating a link farm designed to redirect users. Heuristics suggest these links are used for SEO manipulation and potentially to host malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=sales+pitch+examples+for+a+product PDF link annotation
    • http://topbondtape.com/uploadss/file/12890830679.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/gutujusibadaxikikevoxa.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/76107953103.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jutabidi.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/9068402046.pdfIn PDF document text
    • https://rcot.org/userfiles/file/14590825382.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/fupajisapegasulij.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/zigogeviwenun.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/30298276196.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/31b7e9c90e28f253a0c1440d87d84a2b/77257838694.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/4233031812.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/27244419817.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa5e0a50a---4203710489.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161572315cb1f8---pufedujogexenenelis.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/86813224308.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xeraxipen.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zejodoraluzumakumo.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/58802872314.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/zexatumofen.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/jusuzakurogedidimidaran.pdfIn PDF document text
    • http://belean.pl/userfiles/file/72865791592.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/89870081606.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jt7atonir2veb7s0p9c3p7smac/pejixagemopezerigunigufow.pdfIn 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_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 18716 bytes
SHA-256: d5d4c43571a9edfe33b4178bdbfd9f0c0fdd0905fc7804307e491b8d7145400e
font_01_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14823 11056 bytes
SHA-256: a92676343d8c6374885d8fb97e6dcdb4f13cb0676700d6f46caacd5c51c34fcd