Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db0f86b382e58a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 22:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9a63421a86b0dc9515ea1b103b9a556 SHA-1: 7f72775484db903558bae7a68ee044545475d4f5 SHA-256: b0db0f86b382e58a0e1ea94048caa2e1843c2a5f06aef414e01020d1acbb8f56
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/30281895600.pdf In PDF document text
    • http://benhvienlaptop.biz/userfiles/file/27515123115.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/guberopumobuxinovuwitop.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613750309fc98---18342189202.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/70098862888.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lozamozedeboveg.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kuluxufaxu.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/vazetelakogam.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/pudikananalobinafepa.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/78620973675.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904152031_l3wrtr.pdfIn PDF document text
    • http://marketingnews.fr/images/file/10053525869.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/samolinasepepagiren.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210906011741.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/ruxosuzumujug.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613952b78c392---mepuguzewowofime.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/63017554664.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/48028672796.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/judew.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e781b7e3---jawozazisixemijojom.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/rapavumuxomagutosu.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/74311811517.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e38124b---49951881411.pdfIn PDF document text
    • http://szjg.hu/images/file/10047557642.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jt9qk2uciefmhpkj37ki1bm0r4/5812142390.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/10596368189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spanish+translation+app+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 17208 bytes
SHA-256: 10047a4a46928ac6eae3bb194f5930630376ab8adc8dc72f9e29c599cf43a876
font_01_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1