Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae84dee467165039…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d8c50a1abbe7a0156e4a4f680f5aee7 SHA-1: a686bf5033e208e2308a04740c457efabe4a8dc1 SHA-256: ae84dee4671650392265737ba5233307227b382ac173c783a3d651ed32e86464
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDF files hosted on various domains, indicating a link farm. Several heuristics suggest this is a malicious PDF, including ML classification and ClamAV detection. The presence of compromised CMS upload links and disposable hosting further supports a malicious intent, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://postelezmasivu-liberec.cz/ckfinder/userfiles/files/39614900014.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613237f5cba9e---munedawekidi.pdfIn PDF document text
    • http://wajl.net/img/file/20219160263.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/68124239508.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/972df4a014756b226df42f8f3ca306a1/sexenuk.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/xesusadatalatefo.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/limezawumofizexedizep.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161474cb579bfd---13049032205.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/rinemali.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/labaru.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pajubitediginal.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/49328883353.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/balumitudata.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/87470547581.pdfIn PDF document text
    • https://mattress-leader.com/media/46145700014.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6837cec8---guwegezedojok.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lepob.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wuzagup.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/julewebexokomubopitalomit.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/20967805659.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/34857960.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/barupedikiguvelaxatobuxad.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/kisutebibawezal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=guyton+and+hall+physiology+review+4th+edition+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 18028 bytes
SHA-256: 10e97a645951f31fe93f17ae65a4d4f861ecc25c420b47ebc4627a17e33ad2d8
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 11260 bytes
SHA-256: 58d236a01caf0786fa16a2e498976ba044543a54b22744103062647f2e287733

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