Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd33121149f5e605…

MALICIOUS

PDF

87.0 KB Created: 2021-08-26 04:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d79f22db18bb921a9fb70440e0155af7 SHA-1: 371e76c121b07587d4960b2c738513ca5e0011e1 SHA-256: cd33121149f5e605f9c560720b7c7f412e3c3fe9000d930b5c9da82f38fcbb70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the link farm indicate a spearphishing attachment vector, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e73e4fb7f---75197823689.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec441bec5---mujiler.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e22575ae---7797677712.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/11651499695.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1c32fd702bbbf17f38eeac86c3dfa6aa/vudimenatebokawuj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pegetelifanaxon.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791793872b---fikipetem.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/66862925103.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c8d371db1b6ea2656d8241ac76c6ae28/67383647892.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/libelanilulixo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/11j1pb9hfdo17qd14jp8aq4nq3/69385810810.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3a199d50---96095199678.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/qlpis4ndfhj812uuvj96n9jjp3/39412427758.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/wovid.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45249088277.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/88061711710.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/daxusar.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608208347eafa---96269739528.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/30db7fd9d0a2f84578e1c3e465d34652/75025601460.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/60947721197.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8267c842---5356178066.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/tesibatisixenares.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/65283420685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cause+of+snow+blindnessPDF 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17076 bytes
SHA-256: 88abe75c31998a48c7f4d16d2440ca7a77d9f6d0c0169628f00b2bcd7dbdc4a6
font_01_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 10504 bytes
SHA-256: c719da07617f29180e68cf937874f4833e92ef3180b585c023905a254fc11003