Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c6031bccbd6d6a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-14 02:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf76748c3d985906bb95b4496bf2a5e0 SHA-1: 55d16cf36f09a769afcb8166a04f8b8bb00d7e4a SHA-256: 11c6031bccbd6d6acfda1ff39d88893a9cfbab9e6c971cba1d427539a81623ec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and a high number of links per host suggests a deliberate effort to create a distributed network for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i4j29jqbt4gji4gdl0lfdh35ep/26522669965.pdf In PDF document text
    • http://amadpich.com/userfiles/file/4730634948.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48832373803.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41c4ce427---84403824275.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/76530945528.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ae1d64d7d884c002345a5cfae9e25dcb/niwebijo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xajidolunawowezi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1faf3f5c633bc70c8601c3952d4a8c5c/jenajunobaduzitenepifoza.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d864e26125---83914161016.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t2bc3li44ak4bu7gd9j1t9kjs5/gulirisagategukutafumid.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/bimuniki.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fdfcda539---sisudadotonukomodal.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/81518004461.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0639e57747c0a10f03e6522d0ec94686/judibuxagixikixa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641e1c358---pogibepitimanumotemusulu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fivelodobebitixesaxapiwom.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a12c1725bd820d91dfebce8e6220506/wotugimuwupizarevibisuko.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/66793210747.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1b1f2bf7---zizufu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5883e2fa9e84f6a288de7248a42251ee/xarokopumivesaxaluje.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/65420656235.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8d8db316---diwivedigireferigoded.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i7e78dao8bd2rns0so22pg5d1q/zuwugakovikopinot.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d3204929f11b68c7a4b7eaea5ad86689/5518469442.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/55822119717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=self+introduction+example+for+teachersPDF 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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 17184 bytes
SHA-256: c32693f3e3568a60895cce18e34f882a06a9559c1095894d614749d56ba20881
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 11164 bytes
SHA-256: 873c9051345163d6a7fc317b8c4c6c6e110e9ebef1ec9f397cc76732b4020666
font_02_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.