Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5538faed1c0cb1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 15:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c6c38ddfdfc9ddf71bde7c24e5850f39 SHA-1: cec25856b09ee603a98e389e3f1cfa9c7276a559 SHA-256: 4e5538faed1c0cb165afe2fe77a48a0e3f01300327718cdc0ef2ac5c757b91db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that likely lead to malware downloads, specifically mentioning 'download crack autocad 2014 64 bit windows 10' in one of the URLs. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

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 https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6f00f7e24f3cc616c666802929676d21/84598826901.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1105cfc3f223f3f709fa5fed1604b49b/33048952369.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d04549879f0e01e801db69e0e605e47c/1945174275.pdfIn PDF document text
    • http://dzbnf.com/upload/file///5529291644.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/60614725028.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/13241396813.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/piruropaverem.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/47115676656.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5e86fdf8---55605160176.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4663b5cc8---gixixakedizas.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/64aa1c9a0c9af6d49b5484765851c97e/dixobiwudul.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/nfdf5sa40sejknm1efuqqt7ljc/lalenegazuv.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lbqkg52urvr99rrbsm8eh663fk/repewopebodon.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bfbe7df1f7ae0238b35fcad2906739e0/luxesikawareginugo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/98115662492.pdfIn PDF document text
    • http://dsagco.com/Upload/file/moxewibobepinuroromewa.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/zevewokarazudabomoz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac27cd07---12190983558.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e42475913f39415654116f6a93cd7a49/29375022075.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/60707433329.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fd48f321a36fe51089dd0fd80deb1b70/80708658708.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2c3ce255feece395f2995611617b7a5d/40073261769.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210720_194542.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u4d0rdq5ipp5obk7352c680pf6/44810661591.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/sezele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+crack+autocad+2014+64+bit+windows+10PDF 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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 17248 bytes
SHA-256: 6e7f08553bec14ae4fa64f455c8f5953b2b731c43647b9f534cbd0a626819142
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 11192 bytes
SHA-256: a425e9b1993a0c95e6397be209adee53e37d1b2858a0631cb9d9ade3e576e74e
font_02_sfnt_off00013525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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