Malicious PDF — malware analysis report

Static analysis result for SHA-256 75233bfbf92f7612…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da183011258361ca5df1f338341e065c SHA-1: 48985ad9d05fe5c200d9ccab5bd00aea724fb3d9 SHA-256: 75233bfbf92f7612b742ae94c03db0e9086dfc16377ef077aa7034028d51ea7e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ketchas.ru/uplcv?utm_term=christine+sister+wife PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3af8378b---fejagawelugajoxi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8bedf53da1efa374876639fa5bcf52d1/juzal.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea56e2465---78822138703.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e6bd7982a7ac5a7df9b56107915f89c9/wivujagisagepuzevur.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zazimabe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740497bcf78---66632362046.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ada89486---67731626701.pdfIn PDF document text
    • http://patroha.hu/file/lakixagimobovugidefuda.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091debc9e485---farebewa.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/rafawufifujos.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160859d6311109---vozuwipavu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8bf21d4a9366fae3ce68bd1b6d4dce9c/vokosebetatubunuruk.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i88jav9b48oeciibhj72mb243f/nipixaxelatokevur.pdfIn PDF document text
    • https://senfina.top/uploads/files/fujepaxenasixemujikur.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5774eb746---bodigigagexobosoladurosi.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/18281268937.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gaveluraxeten.pdfIn PDF document text
    • https://afayl.com/userfiles/file/82448769874.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/7798349373.pdfIn PDF document text
    • http://web68s.com/upload/files/nalulolategas.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/26306956117.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/281605324584.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d8462c13d5ebb16de6b7b2dcf9abb0d7/jimuzajuwewazuw.pdfIn PDF document text
    • http://www.celso.org/download/7720977993.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aca1b6ac8145566124c6838022c44919/sijazegebuju.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ec53a993---xinalixuguwukomozowokez.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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 17236 bytes
SHA-256: 31075646f21341ce41acd439460eb516abbfa66d06210a08fbb51a88eb0a16ff
font_01_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 10100 bytes
SHA-256: 1dc6d7594008e1ebc58546fc48f601860217dfc0896f1016b5795f84cc5f43ee

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