Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e688833d0f3f37…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 09:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 352e309527df512f989aa6a2372f7ef4 SHA-1: 654c31598eacc64942e3aa6a6f0c2809aff54e96 SHA-256: 14e688833d0f3f375f7ca3021b2c5343e3ca228f2d92401ffc029ef8f5c93f31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=can+i+have+itunes+on+android PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2atcprmjevfihidd1aucsai3fm/jezidoveva.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zujemawuxereveto.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kizinuzezarebudamen.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90234707445.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/46791433986.pdfIn PDF document text
    • http://safarang.com/basefile/files/lekemazisezekelowemowu.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/95075640589.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/dodim.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/vubigutibixorupepawizinu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nhi9kbug8i1ib4ujru8tvv2uet/28760860215.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1443cd3d5---vurolaje.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muvagejuporirikekuv.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/vubigisanerewesazimubamox.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fekulu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/wuvajarutomuwu.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/tujuzevilimotazasikumubi.pdfIn PDF document text
    • https://scalping.ir/data/files/file/roragevafotosevedosojuviz.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/57159476106.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141739a88d58---64526605435.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/jagelasuboledowuzove.pdfIn PDF document text
    • 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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 10496 bytes
SHA-256: efb2efc111267b6db203afe6b1de623881d5a53d76701d906ad3111d2ae14df6
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 18952 bytes
SHA-256: 2e4833f10c5d1d78876f5b1ce7b6981df62688448d11a65a0844a3209d737d0a
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1