Malicious PDF — malware analysis report

Static analysis result for SHA-256 538cf7656df91a6e…

MALICIOUS

PDF

91.7 KB Created: 2021-07-14 02:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 804c80374de833a9ea2bc0adbecded75 SHA-1: 72518f9c8dd2bfa25dc80752e12b5e91cdde8f0f SHA-256: 538cf7656df91a6e2fec09c27e83aac6fdc821ec8bc4cb3d35db5146995d3ae6
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF was detected as malicious by ClamAV and an ML classifier. It contains social engineering lures, instructing the user to disable security software and execute a command via Win+R, which is a common tactic to bypass macro restrictions and download a second-stage payload. The document also contains numerous links to potentially compromised websites, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/648c69df2dd67d562121d3041b8d36dc/wobeduziwonuvo.pdf In PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/miditatanawutaxanagix.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hb6q47am8nk3ddqblqo7hks8av/11766513175.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/79973917465.pdfIn PDF document text
    • https://aashianarealty.com/file/jinujuzinazuxigizo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd1718509---99923204657.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/dorobaf.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/50053271730.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/16411641672.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/90b0ad82a0b2d9ffe7701f5d1df323b7/60843471703.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/81065344130.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673ca7b4f---dakimolom.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/21617112724.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3b21f460---xasuw.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f7d0456a4294b6c1e8260e1f3d01f283/gitalujofukabono.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/59107bd5618b91d37bdb96107e059c5b/molaba.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ff44b0e4ad693edcda29fae57b09eabe/72607619050.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/26266754434.pdfIn PDF document text
    • https://superpart.com/files/wuwusimujikavij.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb97f2127c---6639813796.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jewukodiribolatafuxumo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8470928095759c17886f24ad06005963/53993401240.pdfIn PDF document text
    • https://go2germany.ru/files/file/wagegakokamerar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=computer+keeps+saying+update+and+restartPDF 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_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 11028 bytes
SHA-256: d01fa03aaaa7a284197f07f8d2dd436dff5bfe759d33d1e32d6d6b5443a520b4
font_02_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 17112 bytes
SHA-256: badf5b1ec061173727075256ece225f3fdc30765f9fc3f3e1340c5a7338c8601

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