Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa7ccd8779d733c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15bfda0d7c81f2460dfebaf2f7fb505b SHA-1: aeef31b32beba2e551198670622eb13154567b14 SHA-256: 9aa7ccd8779d733c4f3c0cf6981df29b6f42f92c65e4caacad8f94756104f472
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other malicious PDFs. The presence of numerous unknown URLs further supports this, suggesting an attempt to distribute malware or conduct phishing through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.smartlandgroup.com/ckfinder/userfiles/files/64526984409.pdf In PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/gasazaga.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5e3b7897---mulujet.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zelesavufabukoxa.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/ripenemakotawelejomoz.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/serejavuvobagekowa.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/pisajajupuri.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/faaupkd6c7feqo1drpjeuij655/jodububaruwamasuwidu.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/94590328780.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/fukuza.pdfIn PDF document text
    • https://braus.uz/images/shared/file/10274840429.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/nuvodak.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109130233415015.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/merizadenowefu.pdfIn PDF document text
    • https://argumentua.com/i/file/gubumu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3185577733.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/21320225811.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/55134091652.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/puq81j0vg64phq8dkv2b83q9o6/2102777595.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/29615013250.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/dinoxabuteboz.pdfIn PDF document text
    • http://timocomputer.cz/files/file/jumuturozuragexovegenozox.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/fomeneta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=recommended+music+player+for+androidPDF 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 17560 bytes
SHA-256: 4a807cf95274ac483476d160a97d1a11ef3c12bdbff9a4eb00d0aa67e7802cdc
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 10944 bytes
SHA-256: 9bb501610bfa1d9c29cf4e7fc04321c2beec01fb193799ec1d1e554dd920e2c5

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