Malicious PDF — malware analysis report

Static analysis result for SHA-256 06aa478489f4b90f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 18:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f28cee468c60946a5699e6b0843b086 SHA-1: 87b86c8f81a24898813336b417ec7a1bac982a49 SHA-256: 06aa478489f4b90fd24957091f1dde7dff93fab26f2f237bc35f0d921085e53c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript stream further supports the malicious classification, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f2aa86e1---totef.pdf In PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/jatumadu.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/92200974832.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xuwefuworozepizojoxewo.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a8bkkav4t7ns01hjti65gopiq7/6101770301.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/nukexogimujup.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/82b84dd38eb7af084bf3420c9448058b/21220226658.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/zarogepogi.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/zoreporub.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u6h52j2ngf0gs764emnh425duq/18544096328.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/da420fa6fec61875ee3a42805a81adc5/14438153167.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/35762335066.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a1b20f09---jeselekoti.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/mazude.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/momamavesajojojuruvagute.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/mowagavinudesutarik.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae57b7a62---tekidukakoloxikidafonozun.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sikixiruxijovivirewotip.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8a82e7f72f47ba64ccc1ae5f4d0c0e49/bumorefuligokap.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/985744f85bed9cccb7bfdc7acfa90bfc/nujipawala.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/1714904045.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/febofe.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/lefedajodexadipoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=just+listen+to+your+heartPDF 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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 10408 bytes
SHA-256: b59ab9c219bdfe34ff8a8a8ea1bca6409b48812427aa8dd31f885c5ee56cc0cc
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 17336 bytes
SHA-256: 6336982413303eba6b9209e7efec6e6dac2f4de38cce3c72a4b9422c06839d1a

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