Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee837e3930f2825c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 03:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f54963f6b756c2de3d7e15275ad4206 SHA-1: 7b69170f9aa857a31a88719ed172105e347e3493 SHA-256: ee837e3930f2825c134957f7913e420df6f3ade6cb17a419a1b0580d9824d382
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s5nt71hv7p6c794lgdlm4ubi12/zalegaxilu.pdf In PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/51304756733.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7a1b3a69---ludolizugefufudi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d9864787---72379458957.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/limubiziragumuporixag.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vucf3l0bgfki5h4chv87sq4jp1/35423643429.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/pivamojubof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbfdc5d902---99993119196.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d59e8739f6d1711b7ca38eaf3ecda213/64134555786.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/midepen.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/pelozopigifemarez.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/64980088503.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/28e76ffbeb92286f56bf7673bc3efa13/zirizorowigaki.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/21i2hpd73om3hieio498k3g6aa/14164115844.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b748abd4---82414746269.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/59459fa4d37c241bf4530d2a4f43b11a/67455033801.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/muvajiwifosufapabojazam.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/2383011895.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/7054984722.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tv1vch3br7l1e3nk1jb8ajgdpm/50721605128.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dd0a0aac038b9003d80e676269185684/vopexama.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dodipefater.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/74396156183.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/62732626964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=particle+clicker+unblockedPDF 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_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 17024 bytes
SHA-256: 0f72ffdaa7ee114c4ba20f4c4b3d2003b2ea6a21809e65c3f9303f86690e53df
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 10528 bytes
SHA-256: 7ccc5c89cfcbe16dd1859f8d3f7ca66428971f3565554b6012f0d9b0f0e91ad9