Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e873b696b6afcd4…

MALICIOUS

PDF

93.7 KB Created: 2021-07-01 17:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 506b8a5ddbe6a76e359888d46b6d1adc SHA-1: bf266582cb7e26ed68ed9d5a7604a0b0a3f730a0 SHA-256: 4e873b696b6afcd45f8e69d46bc4045193f27b2e77cc20f54ddd8991b10b47b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://catamma.ru/uplcv?utm_term=madame+forestier+character+traits PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077923e4ff---xixusisusinupe.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ngs5ech2nn68gi6f47222dbh6v/30585300160.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/rivozimekabogunivega.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/gapezujodojabixi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3acd6cb5e---30061393456.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fc8ccadc---tekoju.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f29ee1875acdb05659bed9192dd5178f/putibate.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517221937530031.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vnmd7296j6ah630usn73665ka7/sufarila.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/ditikipexowajix.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/94536640708.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b661748ed6---nefiwujuteragajukiv.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/jarunewozusapufomilut.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2f5f081b---lefusulalorizorige.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bae54a20e439c45292c14657c0dad3fd/lijofigokipenogigegikulev.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/zijodenux.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/g0s0odp94f3pshv0jvdk3t43n3/zumasasuri.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e7gknibfsqp2ltr23avi341fc1/wevodigemeno.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f7fdtia8mp7als826m6vb1djd9/bisitetumivogevuraro.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e1bfceff571cd44aa06afa0ebab6b008/86405465625.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/11279545823.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a5a409c756f3b33cd67f5b70b461d9e/jobali.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/24582825007.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075377fea98a---85541505315.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xumigaror.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c6faf191cf7aa82dc3fd18d10a1eebdc/13624237612.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 18072 bytes
SHA-256: f4cc21efde5babb80a07086c2fe2a437e7b927bfb191015361546172a461803a
font_01_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 10584 bytes
SHA-256: 18a7084d75e3b9337f2c6988e189fa6bbd1b53518533cb64ebd0e5f0d8c4246b
font_02_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 2372 bytes
SHA-256: 00eb975dcffe434aaeba46b7235ded4e908230d109feb8fdbe236371db421cd0
font_03_sfnt_off00014f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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