Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24f4e1761882bb0…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 07:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a027474b5e467310bd237948dc3855a SHA-1: e8fd090f328fbc6bb80b7cf0b1bef520026d72ab SHA-256: d24f4e1761882bb0de57496eed648fc5b855d3510828a2976d495c4c0b2b6490
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or session tokens by mimicking an MFA or one-time code prompt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing attacks or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://oniceh.ru/uplcv?utm_term=how+to+download+minecraft+java+edition+for+free+without+tlauncher+and+mcleaks PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/918f2230182b7e2710b16e64777e429e/27300443198.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de10785b86---lopisonapubusivimubireji.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31b142efc---vibikisogukemujuvitej.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/sopajofetisuxeged.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/98449733564.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722979ed75---55615456430.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c06d73f620e4dfa5caa950c6e85a0549/gedusatij.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160942837c31a0---zelagiki.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/wovezaradidoxufoko.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52797dfab0f7c8e2ea16c3ecfef63335/wamunegudirorowus.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176a37f82d---luliza.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa54ecddcec---40935580173.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/94359521628.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa1198d5c---rerokadezoba.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rijowofovibovunabapik.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cbf82c91---94584136816.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/wopagutusuvutuwokoji.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kosuxa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c3cc8e790---kageduwerus.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/fipovuxobutewizafokopafeb.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/rfksrjh9scsmr8pe18ji9bk84o/dirosovakezobexiwa.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/4282553126.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/zobilowuxiwoxaduzow.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/365607ce2431a50ea06ecdabc6446b01/sexakovotafe.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/24205514026.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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 11208 bytes
SHA-256: ea93af1df133cc59570a66802d45eaa283acf05027116f479fa6338589df7be2
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16724 bytes
SHA-256: 589243f495372598ac5dfd76999087e1258f1b9037dbe887c8fc741ab03ca8da
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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