Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7f6e6689c5d380…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 11:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6289296e6581655b91fe0661f1c6246c SHA-1: 014a849628d9f8ad6ac60ca4164762df2d9091d0 SHA-256: 2b7f6e6689c5d380b3f09dad6b7098d644cf31183fe8bfbbe659226323c8268c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://tecs4.com/intranet/ckfinder/userfiles/files/5042461259.pdf In PDF document text
    • http://gkz-crimea.ru/userfiles/file/80257932562.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/45439297691.pdfIn PDF document text
    • http://jcpingie.be/public/files/63968260240.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/wunozewafi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e9f5a01b940723e4e56263fdcf50dcbe/36809227531.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91e74bec---54072283580.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133550cb92f7---50874601265.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/limatizedixokaregozaj.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tonapezovorokomuporilun.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/15959946728.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/5862489465.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5566dcc0d---41236612870.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vubokilosipigamejazo.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/nedasulajejelotebazew.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/52429402070.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/45300798067.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dudilenipasirepizamiwu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tquvds5d03p8q6n4gv6rbtkdn3/xodejavumupowu.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/41217871255.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/74622385730.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/badirulikinodorazajovatel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+solve+for+kinetic+energy+without+velocityPDF 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_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 17712 bytes
SHA-256: d647503df9ecc4d6f9c79f5c48a9bfcbbe70c645deae6b06fbdd2b420a551a2c
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10904 bytes
SHA-256: 0c8130ee39aca253c655ccd2a2efdee5a63029ff569ef0ff44de1b1563bc23da