Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc072b3d3c8f8720…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 22:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52e7f0da4b4a9eee92e6cdcc69dfc269 SHA-1: c5fa1be5f8949c298f5df193f94a5dbcee04f359 SHA-256: dc072b3d3c8f8720b66484cd0564e8f3276df96dd735bc95d1e3f627300cc709
156 Risk Score

Malware Insights

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

The 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 numerous external websites, many of which are hosted on compromised or disposable domains. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161449e7497624---lofulokatebubufijob.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0f3e53c01---23204127022.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/mewumepubu.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/53752124300.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/56102928385.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/91012761499.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/timad.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/gepoj.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/20126397234.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/37576700627.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/somasavopudalozesez.pdfIn PDF document text
    • http://runhouchem.com/upload/files/pukovufij.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210903021350456.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/cf9a1a117eb3f2f719e5d7ccc69e6e4c/zadasivetotewagivumufo.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sobofavopufefaxa.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/2861878925.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/87521535481.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/65853027283.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zifiginipaserilanonido.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161347dd6b2355---sorobutiwo.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/gimejurinimudig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=overweight+and+hypertensionPDF 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_off0000aedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDB 10916 bytes
SHA-256: ef3fa6cb5eaadc34084331fd0ebeb9074177a54397715616413fc66206b6c022
font_01_sfnt_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16572 bytes
SHA-256: a8f8715c0f8e73f6041c5811849eddc71b4e95c803ce59620d6f0a9c30c16671