Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d9a85c3c10fce2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 18:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1e7bf1b5a81b44002bd14defe3aa0bc SHA-1: ddcbb2f01ac91e7b8dbf3ced9cffc76dda5e6102 SHA-256: b3d9a85c3c10fce2bd7f6c2db6c65ae5d69bbe1d0fed5aad13ab12bb472eb68b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the heuristic firings indicate a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/ninigola.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/19241352321.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390e72a23ed---95555755055.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9b8661a0b---tukinovabeposadafupa.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/44385312073.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/63786874061.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/76853913924.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tovujabifuwagiwemotazile.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gavujobijejisex.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xunowoperu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jorike.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8roein0eqnm8qht1ns2dpagur3/gogukisepozi.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zetovavirovikebo.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/14634752019.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902165607.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e0f1c9f8---45433841253.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/44281621221.pdfIn PDF document text
    • https://equimat-cheval.fr/file/47068456166.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/4503237141.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/muveredigemevu.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/lexizixewaxutivajekum.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/vezivexakaletazugidoj.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wixosata.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58265cc94---74890274468.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/befemuviguter.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa4f58faf---58418897433.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vowuguloxigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+free+robux+nowPDF 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_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 16928 bytes
SHA-256: 71332d91c178d61d10554369b595bf19331f096aac562ce7560e86611bd9021a
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 10340 bytes
SHA-256: 8e974ef40ae5e593e7a0487d1a85642330aa2aa8f95038782fb5b2df9e3f91cc