Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cdfeeb41fd3e22…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 19:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b80047746fe01d50e8852283d3015f87 SHA-1: f2d81f07443d0732e808e7cb7e6b60550d620e32 SHA-256: e5cdfeeb41fd3e22336ac667261d1dbaea3ec0f1064d029681d1ea35c94146d9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on disposable domains or compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ipost.mn/ckfinder/userfiles/files/wapisidudagedadovoxaxopas.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/39314342792.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/pirovozipixazosofezo.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/6227879392.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • http://ccshecea.org/upload/files/40556641247.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/26332599707.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zibavijadanebanume.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/37387239292.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/fulabedikenowavowoxofif.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/36678396179.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/5688590926.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9f9b8769118946cf2d1f064d44daf8d/xabuveguxogopinufe.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kozida.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wowikukufu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/63022224042.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/sugofelujekebogugopadajow.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4bb03900---12568079891.pdfIn PDF document text
    • http://domosplast.hu/files/file/valapipox.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/13877573049.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6hbp5t3taierrnee94ng96sm24/gubezonizu.pdfIn PDF document text
    • http://195exim.com/datas/files/perazox.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/72251451074.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/suvamozodunolaj.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/netofim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clear+location+cache+androidPDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 17068 bytes
SHA-256: 393d5c464caeff4d5ad29157f8422ba948d40eef6db162bad275c839c00514c7
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 10332 bytes
SHA-256: f3d4441c9033be4757bc85fefae6de1e4ffc5d074aaaea049731e11cd95c23ef

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