Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b23a0e0267a34c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 10:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6054ad55fc3f3153bb03564e7e4e672 SHA-1: 265e3abdd821a1b494a1767cb240236b9e5f52df SHA-256: a7b23a0e0267a34c2169b036f0beebb83f4a174d54634142ebd78500b546bdb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=coronary+artery+bypass+graft+surgery+pdf PDF link annotation
    • https://ratosatu.com/contents/files/79403442648.pdfIn PDF document text
    • https://wsbtitan.com/images/file/16381753976.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/90222437796.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73b41ca8d---jazawowatesotu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/38095882791.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8218789384.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/xulenegelaravoxobonopet.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/mn76kf7c66mpinibquie91aba9/76956550185.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/63022090207.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/91704536289.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/tukoxexigejut.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/88389974947.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/51781830378.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4f3e58547cebc803c2870b56657e99be/45137232372.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/numewefodidoroduxipuze.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/gifurubek.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1df231dcbc0277fe81a5596b013ff9bd/kawuxifajulofitabofalazo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc046990a3---16820811663.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab698949da1---9237608981.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a260114190b65d09c653cb5194ab5263/63751357135.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/15669625693.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jexubired.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://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_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 17220 bytes
SHA-256: 57c3fb933c9682bbb2818cdcd864441aa892c8ceae0f65c943921477bf5d926d
font_01_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 10920 bytes
SHA-256: 038f5a226ed5aede105c43a1470cc73b7341c215a3c0ffc82b96b3f8e488dc16
font_02_sfnt_off0001418d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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