Malicious PDF — malware analysis report

Static analysis result for SHA-256 e453a159baca5ce1…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 12:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7da9b49af6fa2921839b58d72ed804b9 SHA-1: 6827d3532cf7a62252f5b3555b22a7c8f499430a SHA-256: e453a159baca5ce136682ae355e6d52489268c76e1b3ffb331ec6476fd9c6f90
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://charterfori.ir/basefile/charterforiir/files/25943523290.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/47996715997.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/db69000afaf67fa97789da655d820328/zunipuwibub.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/59bb21ed7918c7e621ac741e7acd3c0d/fiteja.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/wezejafupuninafokujep.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/nijimujifefodifiwiraxa.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/pasejemosodigabelos.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/26106655262.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/girakuzuwolimesatupabo.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/d2le4f3baiotb93ct7c2r06nvc/27181875833.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0ab3f695---26568976441.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0be3f9f4d4ced0a04a73cd10598dd101/80318453992.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o4ijea0llet988jc1ub56gkemk/wejixapofapafuwop.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/bikalejabuwafadis.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782beb81947---21679588345.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/23717644897.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ocsb2jq37rbi9daj4r4tolfci0/20090776302.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7b6558a2---25673181570.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/pevazoradoboxodevoxav.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/73f4c16155867b42d2dcbbac83f76652/14304262649.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
    • http://agama-rc.com/upload/files/99678979023.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/jememule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+now+you+see+me+2+online+free+123moviesPDF 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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11304 bytes
SHA-256: 056a40f37897b4d9eb5c58cab1dc3e1311cdb4e91f7010aa5bf5b23f95318f0a
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 17996 bytes
SHA-256: cef80396a966895ad75e1f7995a76ab40787aba7678011a7a46efe9afb01c1d3
font_02_sfnt_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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