Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eb39e88942a397…

MALICIOUS

PDF

86.6 KB Created: 2021-08-22 00:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e7c667156f6b048928decebeff8b950 SHA-1: e5e3fb669ee1d4db385b5c460a18124d412f0d17 SHA-256: 21eb39e88942a397595870b27af0bd07dd8ce727fa30425d8ede4336a6945045
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the structure and URL targets suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b7000d91eb71544e4b018dbf1d9496a/79383211036.pdf In PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/guah1r85gqb502pr1347gp25l5/kebuperuwonurari.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/gafojutubitekabimed.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lixafupajunawatufukige.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/fg64n4tumr6klh52dp02k97qem/82722249356.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/58955873867.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28789084157.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/60037619666.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/tanapobevosene.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/60772062415.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fedikabakiwoniwolugiwok.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vusapabelitejaku.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/19093931222.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/lazut.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/xajumitezurexi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948482a0a7d---67250428926.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3acae820b---popuxenu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tuxufukoparexigojaxur.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/98577847315.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/nevotutazuxu.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/81186624483.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6s6d0ut4t2ube982okdp5lf4u/87715247478.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bed416e26a755fe5323fc9789df57593/93707154600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=biblia+de+bosquejos+y+sermones+tomo+6+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_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 11512 bytes
SHA-256: 883bc7cd68c6dd4e1b98154d03d90764a67ba9c5a40dc01feeeb25630be1bfdd
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16712 bytes
SHA-256: 860729c485e23c43dd2b3c6bbb07688cf6345aa2ddf1c87ed20e4ffbe0fe0ba8

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