Malicious PDF — malware analysis report

Static analysis result for SHA-256 633da9c99beb1042…

MALICIOUS

PDF

96.7 KB Created: 2021-07-25 04:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49ab9c75ec26e6c47d0ab4d5d7039f54 SHA-1: b255c75ebdf8aa52d34b003a5a98deeda81b1578 SHA-256: 633da9c99beb1042b7884b11a808199ec68e0127feaee47fba6eebc839583a6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c3fc365cc9b44c59c416f90b8145dd49/nenujonexuferuxigamapur.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aa4ae1f6a---21146771646.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ccd011a---nevofoxevuxinene.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b22ba897---12887605911.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/11f6d4589d9bb774537c9e47184646f1/86634013419.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/48446761536.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/vaworajunese.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b9482f43d294497af306bfdd65a67155/befibasuvire.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xemuzegulabe.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/volilivufefejobunaji.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2050ee59f---fudatokozorafuveliwunakar.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/558cf289148ddabaeac3f05b9b3e3486/wodasedarenowupuforap.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/jegamudis.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836150bb45f---49344790668.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18080e949b---72094687464.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/20003075140.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/dipomepejewu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/59edf9182332bf416f3bb147aeafdf5c/niwitupugenelag.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wovajuxurenurakolo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/44840300601.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m6bl4qoggr1qb6n0vcmgvtuc13/fedavinekafoxukija.pdfIn PDF document text
    • https://airshow-bg.com/file/zetikafodawowixafibifex.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9c99b1bffb58aeefce6adb01fc925290/74189490977.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813fc922915---rukitugafanegasajodere.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/64913991066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pelicula+completa+el+despertar+del+diablo+2+en+espa%C3%B1olPDF 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_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 19712 bytes
SHA-256: 41aa9a6670c47239095930f1c7c1435c44fc41df3197ab2f4b063dc523475295
font_01_sfnt_off00014003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 11244 bytes
SHA-256: d7f07559fd7896fa7ca6561882fc59f458dc8a44a12b6fce4c7315cc1384404f
font_02_sfnt_off000159ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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