Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fc0dfb36151b57…

MALICIOUS

PDF

98.0 KB Created: 2021-09-06 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a2dd1ac17e6bf4361076d78e449c9e7 SHA-1: a017bcd9a0114598c8bc79ed3ace636a277ab08e SHA-256: 80fc0dfb36151b572256348eb20605b376015b0bb5da337e488d11b5074bfcb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8111b49ebc---jipepiwudofamavifupar.pdf In PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/losaroxeruva.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/78420173092.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/tovisujititizitagenud.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c5700b3a---wilefi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/97151713835.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/sademebawizij.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/37460075769.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/duwenomazin.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dilomomaxexizokafaluxi.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/38895070609.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/94364362318.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c9405cf0c---28772782413.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f02834ee---52328716015.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/37546636228.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/webufo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/91468960728.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/vizofozifal.pdfIn PDF document text
    • https://bataretak.com/img/files/file/13406926443.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tubolam.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0c170c86---36973586235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fahaman+mu%27tazilah+pdfPDF 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_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 10416 bytes
SHA-256: 0d542915e3e707c19e46dc68579f6e1d93f92f9344fb2fd9a9ebcd1110e73007
font_01_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001414f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414F 21144 bytes
SHA-256: fe3c1c6d7784cb3c60833577573ea327518e9d542891fb7a79e063f37c5ac521

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