Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de5e9cfcfeae612…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 08:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8f37c229af7ded32ea83eda2cb30b70 SHA-1: fe3169c42d322a219ed95df93e6b5b089c5de287 SHA-256: 9de5e9cfcfeae61202570b7f238a2084db0f8b8a8d9803f6a137f92fd9c85a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://pistant.ru/uplcv?utm_term=counter+spy+apk
    • http://fukaofoods.tw/uploads/files/202109171751554675.pdf
    • https://groupunsur2.com/contents/files/bovuteg.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dba7891f1---numorozetatubepiva.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161354292b95fc---meloburodolukobonosaj.pdf
    • http://ctkupavna.ru/upload/file/muzupusunasuvejukifokatew.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/dufaparebigatafu.pdf
    • https://nidi.mk/ckfinder/userfiles/files/lilezaxivitu.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907235107625552.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/regedejamanizalipogivutid.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/vulefokulesomesugixo.pdf
    • http://agro-norwa.pl/userfiles/file/zalawe.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59198105913.pdf
    • http://codienlanhtrangia.com/Images_upload/files/87540125421.pdf
    • https://zmiz.hr/userfiles/file/65553570556.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/tagusanurozarineked.pdf
    • http://runwellconsulting.eu/file/file/32433965975.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/pidumekadena.pdf
    • http://devison-matras.ru/upload/file/61191056151.pdf
    • http://civicwomen.com/ckfiles/files/rosemavuxoxixejewo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d095eea2de36ed2974b02fe6ff7d33ae/kefitabejajigol.pdf
    • http://dinhviht.com/images/newtech/files/nuwodizilesinomoboso.pdf
    • http://uteambio.com/upload/files/82122759803.pdf
    • http://adamlegal.com/userfiles/file/liruwekekonitasefuneseb.pdf
    • http://chemsdano.com/upload/files/93637658718.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de5b2294213b8c1aa8fb198a16750ed6/wesasevosil.pdf
    • http://tech-sub.com/userfiles/file/zijas.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58c989fadf504e968537ed741b85cd4c/latozowadutejataxuteti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f9.bin
b05a4948c82564b0d6ee9f5314f32fb08aa57c99b71ca8684b87eadd956b39a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 10444 bytes
font_01_sfnt_off0000cbf0.bin
25c6935fecd3202068d6830cfca687827a184e036f61c43ec9af5a324827b53f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 15804 bytes
font_02_sfnt_off0000f3e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes