Malicious PDF — malware analysis report

Static analysis result for SHA-256 236e3b76bc1a7021…

MALICIOUS

PDF

127.1 KB Created: 2021-06-27 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 98996aa2f5dfefbc720b9afe61199603 SHA-1: fd084186a0d25a842e6354c7cf45ab5ac36017e2 SHA-256: 236e3b76bc1a7021b73452de8ec9a010e608360a66814f20d97fd6310a30981c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fd5f86c50708fe2106441859b0170a46/regavanekekukofikeg.pdf In PDF document text
    • http://ingenermarket.ru/userfiles/84666557633.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9acb60e29---jojeko.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc44c661ee---vetoxiwetibajujokaxiripi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a359ac1fb9ed51d41499bf509b4c369e/sumib.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/69731103576.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210605170703.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61bcacdb---vesonevafeliwegerowu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/km6jd4qjv7654hg40aaelqn056/vexefop.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85648879809.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd922f21e---bopuwuvidigujovugoside.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/50350906720.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c5d4d614838c7eea7f7aa42b64843323/38662699184.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1vjiclcvnbqek46eth4a6ffah6/89088275655.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3f1fb0508---fosixu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1420abfd57c4f7be73e1b1f6065ea3d7/nunepabivabikexutuwulofi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/favulil.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4adb86432---xoxivaxutuzesegibow.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b4fb89801412d2243c6633b10cdef59f/nagunigopo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/gtj40mvh3d5fl2e772inavf3ni/fodokopuxidebokupekoligun.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d148f0c40---legirolenawezovagorogowod.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608180ff6793d---54499167709.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626563d30f---3711776262.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f216b947---7459254761.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/muwexerefofamavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=why+is+my+steering+wheel+shaking+while+drivingPDF 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_off00018d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D01 10924 bytes
SHA-256: c74b1ecfa2ee971d986c12ebcd9126e1227e76c6251983d748982d007501a282
font_01_sfnt_off0001a5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001be0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE0A 18352 bytes
SHA-256: d968ca4a35ede4257df80efef55c5ee6b792d234ee1df0d796a1eb4447fe81b6