Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d82177fc84a50f…

MALICIOUS

PDF

102.2 KB Created: 2021-09-04 07:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8584c64ab971c8a6f6b5122e8085ff09 SHA-1: 368778ac5fbbdaf71d6dbac99850f957d84317a0 SHA-256: 96d82177fc84a50ffcade2b35729f858bb328e9dfd1a1e78896f15bcd5b5f6f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90c1ef004---52466896718.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/kekobuwifo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/bimamikupulunenanamuni.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609719e1c8d71---bimejutojixinoku.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/xowevikuzonije.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c3550503a8188e1a2bc565ec773487ac/49460248402.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/5607899221.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/77086618499.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/375069ecb564c1ad18abd0703ab57a01/nexuliwesusimogogil.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612135c6e43cd---jifojixa.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0020720001619806878.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3396c40c---89975522928.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32d1680f307d5b0d52862b9940d3a64a/96657981439.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4u9scjcvhse7flgj1oi5rh6tkc/25269075974.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a13df2dde---60644285032.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210826_065640_8342.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db05cc4c0fd---23456089738.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798de92495a---mumezadubovunedobulini.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ce81acad8601949111c70819c7bcca3c/zinopagiwijavetig.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7c244b3c5d33e39d469599fbc99dee9/8437726541.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/gupulubivawiket.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14676323089.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cb6769f11de634a41993f811d0df958f/fajefoxizowidaxirajav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+worksheet+for+lkg+pdfPDF 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_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 18436 bytes
SHA-256: 9c3e8f26ec2ecbed7abd62e28ae3454fc4e52dc85d2cfba045f363cad2fd7e7c
font_01_sfnt_off000159cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CF 10980 bytes
SHA-256: 7c213bb570c47d0f8881dfa53e5cfc7fa5bee5494cec5771d6e7b07c9180e6c8
font_02_sfnt_off0001732d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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