Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b161bbff1f1436…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 16:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d25e5ad214a34950fb032ccb90fd9005 SHA-1: d7c8eb5be9d8b1a6280f2eb1de93c13336a22041 SHA-256: d5b161bbff1f14362b8b80c64b65ae51e967a1dcd44d1db482828130a0da73a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations or appear to be on disposable domains, increasing the likelihood of malicious intent such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.tobywells.org/media/fckdir/file/fumabarijediwimatodo.pdf In PDF document text
    • http://qhchemicalsfeed.com/upload/files/44170714475.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/27596013318.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131d99542afa---ridadugasusimos.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/revezavikuvaxezujezo.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1210466976612f058b8743a.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/67743344124.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109020112306145.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/winodizebig.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/19301201665.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631217102.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/1922692752.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/guwelizabuda.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/poguxizinejap.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/34790802470.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/626176190.pdfIn PDF document text
    • http://www.bash.cl/media/file/bileralaketi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/36021836970.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/rizuvaduzemujovov.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911120304_NTU5MjU1NDA2MjA=.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/80661816248.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1967713c---39518647605.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ee2ad1---tezajowasojajamuwaki.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/juvurazepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zinitevi+for+pcPDF 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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 16904 bytes
SHA-256: 2274c1680a226de6e9755d7f687fa01870617bf0e6faf221500bfc504f9a5b37
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10124 bytes
SHA-256: 91b74e4fb0b08894c8e50a20ed30dfdec3ebf27d3ebfb9d189d164a8a15e4400
font_02_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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