Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc56dcd2da35abf…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 20:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc849273d63852ede71842183051534c SHA-1: 90b87011e078567540948b4300751c50d333da81 SHA-256: 0fc56dcd2da35abf29d3e9d970297cc9c6b72abb2900934b12e842ac407a3ab9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed for SEO poisoning or to host malicious content. The 'SE_CLICKFIX' heuristic suggests social engineering tactics to trick users into executing commands, further supporting a malicious intent. ClamAV detection confirms the presence of malware, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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
  • 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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/moi58vbs7l582vbfbkvcg0t1i5/85588426958.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tf24np20s2q0rkph7f091ssj3i/revov.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a382ddfaa536ae467861df81bca7867f/31167481885.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/84131656305.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba4e5fc73---91539002651.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803517b01ce---75384395079.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/leruvikiduzalo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084275433641---mujaguberuragigunimirujon.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/78055453012.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df991ec81d8576697868ce1371d5d78d/doxapogapugolu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e286ba15---37077266720.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/35d3d3a8b7675434307aff802053cde3/gupebelafeb.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb49f2e334b---54723445942.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jitijigaxusuzojutu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8c47h1d2j7et74jdp6rhcht3sp/rebepo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/ziwalerujixik.pdfIn PDF document text
    • http://palami.by/images/file/faluwajolapa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082651ee1b5d---sapepivazodorima.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gapuwipoladitokuvim.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2674cc7b---53750078359.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160812eda2dd75---83357939679.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/66694706901.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/89844642010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+dual+monitor+with+laptopPDF 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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 17652 bytes
SHA-256: 36957901828c7d74e7d8d34bc80bbba2a99dea6a5aada204ace41cdf856de1cf
font_01_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 10760 bytes
SHA-256: d9af875b2db2e010f681be761a12eeac8db86c327bb61df515f6ab2754594dbf
font_02_sfnt_off00014345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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