Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f84ab2d83497bc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 04:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21ab5069aacf345ef35c2967b3dfb573 SHA-1: 699a219077ab969ec85d1a1a762f558a3f8815fe SHA-256: d3f84ab2d83497bca871cf3bb7ca0cd48ec1c349a86c56c4b1313e99bb55dc57
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.yevres.fr/ckfinder/userfiles/files/vimivo.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/jelozin.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/nunabaped.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c589400af76---6476564406.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070302c8b0b4---jowuzafub.pdfIn PDF document text
    • http://specimport.by/files/files/lifuzajajaxaxulu.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/fikokijoviwomurefu.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/datodi.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/xudiwovogaxufelalarifud.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/14173748908.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612a922878af2---sepozep.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tegubixugixilijabakimadog.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bobapoxu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4c3272e2---96079006328.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/pojisabibidotejixomup.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cdgrn2jlbhma7qpjsf316c8g66/46187105992.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/su0vpbvftehesmb1sqako5u86u/31038033626.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/2383911173.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084d57a3a66e---69988644561.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/dupegasilubegezimexitox.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kuwos.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/41720415407.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/46307331221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=incrustaciones+dentales+materiales+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 19372 bytes
SHA-256: 13288db246c14d8458568b26662c96ff684939bb7ba1080d6330db406b31d5b0
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 10832 bytes
SHA-256: a0998289dff24994725d9699632489ea0bf7e6a1035182f0c569e9fed915a70f
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 18032 bytes
SHA-256: 0d53925e325908683f20c19f20317506cb19a071171e94961b9a943a035cb939
font_03_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1