Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef473fcf8db20ef…

MALICIOUS

PDF

77.9 KB Created: 2021-07-07 08:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d23e5fc2013ccd0124fc5a8dc0c65cb SHA-1: 5766f7fb057835f740effb6c6f4186d74120666c SHA-256: 2ef473fcf8db20eff6b86878b087524725ebc7ef4fef98c8366d9a97641ab952
156 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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple PDF link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/s4gkd1221vl9eip59f9p6irmtm/japelulolodetujo.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/247a226d8f52bb6c6e5ce736dd8b85ad/82287645197.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wekep.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/cvicg6hnrgo4ivcd7jddhne3a2/90943628209.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/38d8bcd8dbd90ac2f5357477d02a9b6b/85298049631.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ffebe92b73b1034f969250ac72b3cac0/49038485846.pdf
    • http://kedehg.com/ckfinder/userfiles/files/2602946978.pdf
    • https://aimara-bg.com/userfiles/file/mewenovojuj.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/257b8d5b2ea2017cbdb55ef22b1541bc/wepugi.pdf
    • http://jjmcp.jp/userfiles/Image/file/14086468370.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/30b3fdebb7dd55e824a788a0009b1b32/satujuvizogibebuzovaka.pdf
    • https://leganordavigliana.it/uploads/file/94607043357.pdf
    • https://balajitutorial.com/admin/userfiles/file/roxezokerimisu.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwezeno.pdf
    • http://charontrade.hu/data/file/70591602117.pdf
    • http://arci-mp.fr/admin/File/vamofokorilezibovegati.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m23j8c8ksuqhhjtjgb7k6135r8/jazexegezisemex.pdf
    • http://wasserburg.pl/userfiles/file/78889738284.pdf
    • http://congtyrongtien.com/upload/files/lajovovedegavele.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea995670f8---davekuzifaxugolubanegetun.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/521a7e98c4b32b90c14ba6f7087288e9/61433728643.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i396qpifrkv4pqbqi4ri31um1u/47141084527.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aujb6lno6dd4ppm7invtulo622/57088490542.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/008fa44761534f8ec5bda22a35833ed5/9960193565.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/omvtr6cacjndp237i9789o32mm/15345078127.pdf
    • http://best-infosystems.com/userfiles/file/wiwamerogunutanab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=miss+meaning+in+bengali
    • 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_off0000cc85.bin
c28061618343aacef552d3c0866c9443c0fc2c3d12a2cde40d2d14cd7054005a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 10268 bytes
font_01_sfnt_off0000e38b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16792 bytes
font_02_sfnt_off0000fb9d.bin
dda3df6e8df0478ff4a9ad730afc96cc09608d30ec239e7a0d55f0908ab55660
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 17088 bytes