Malicious PDF — malware analysis report

Static analysis result for SHA-256 00636bc5f6c55147…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 19:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5b9e268a47ca1c4ff7cd497bfde9136e SHA-1: 01691e02fc3404d907294d56b762e14a1f03556d SHA-256: 00636bc5f6c55147fd1f2341650ba7158d4b0d16a685762a2bfed9b2f313bcb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/36558751688.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf78bb2af3---vuminatakiti.pdfIn PDF document text
    • http://haai.org/upload/file/varovugi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/76065767292.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea21b218c---43166953167.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d0cc2604---pawumuzipapakafa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92bc65ccc0---fegemimerakoxer.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/60847140420.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1953d3225---23804402372.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/901931562.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/sozoli.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5mtgcmnuosm4o50ou14cadq609/11898747105.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/735b53e027dc3af0499bc6a21b9032f7/weletigideje.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ci4c2sohtcho62269p3kail8c2/zalazasama.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wabujujidoxubejozaf.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/linufesunuji.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210804/2108040843471639830aieu1e3oo9u.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4eb448c809975292f74dd8be7224f3f4/keput.pdfIn PDF document text
    • http://df-foundry.net/d/files/tefajuputi.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/59818922355.pdfIn PDF document text
    • http://web5gstore.com/Files/files/67185073843.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/kegazive.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/fovupugipama.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/vewilitafen.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/bubowesewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lakewood+library+hoursPDF 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_off0000c2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BC 10632 bytes
SHA-256: db94222b2181fdb0692e1409faac3b2e1b75bf6576154eab0a84a5efe463dc51
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17204 bytes
SHA-256: d8388547622079f7afd357cabfa843f9b19642c38578d3da386a8d2925449988
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1