Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f2efc0e1f3bc1f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 21:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b61ea7968e98c612c08a91a09df1daa SHA-1: df78f7561c9b598daa6c7b829e2b88211cbd6a81 SHA-256: 89f2efc0e1f3bc1f3c85b8123b6ec0535bd9e0b2a543efe799d495ebe2888805
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point to a strategy of using SEO-optimized links to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+recover+vault+photos+in+android PDF link annotation
    • https://webshopplus.nl/app/webroot/files/userfiles/files/12041074200.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/telilowutatulu.pdfIn PDF document text
    • https://novitas.ro/files/pesuvamulifusez.pdfIn PDF document text
    • http://onlinevay.com/upload/files/dobipamu.pdfIn PDF document text
    • https://arerp.kr/data/file///fakazerox.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/84936127208.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sejanomoline.pdfIn PDF document text
    • http://chinalabware.net/d/files/bavesixopepotubefemo.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/76685706347.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/80923375786.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xekajikowodota.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/mibitopixore.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc139f0c59---pepimolafipisude.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/voxitogoj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/67759930127.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90131816457.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jexasubabalajenekejal.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cddbd8e08---degegoj.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/34888961561.pdfIn PDF document text
    • https://ever-progress.com/upload/files/28722253872.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/gabava.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed81e762---ravukefu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909075009968886.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/wixewarosenikuvol.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/79489066945.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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 10852 bytes
SHA-256: 8d32eb916cf92fe8d9f89f50c633d83135048071bc9b1718a987eac565d62512
font_01_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 17444 bytes
SHA-256: e6d97bed306e6226be91f50e1d55d67d853a5690e3b36df0cb09f9b5698d7f78
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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