Malicious PDF — malware analysis report

Static analysis result for SHA-256 509fcdb122fbbbbd…

MALICIOUS

PDF

115.5 KB Created: 2021-06-28 06:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff5827f4724b938fb75fd6fe69b1113a SHA-1: b2785b172dee7c0bd42e9db97e0e643f0ead8387 SHA-256: 509fcdb122fbbbbdc1d9a1c66122b7271ffc496508a7898c3092651d26a482fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple unknown URLs suggests an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82df51733---92466522294.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608dca1435fd5---26305242451.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/80300694083.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/309980d95dc8b709b7af77131f3c6646/73895370131.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19fa6ea5---sasuzezumoxotinaxamo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929cf245b4b---28011253683.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10636c2c---pizugimun.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dumazojazuxuloluvazumo.pdfIn PDF document text
    • https://dintek.eu/uploads/file/sixuder.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/4190890951.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab66347bdd---48954265246.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/16961765383.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40f105225---bupewaxatojusinemexis.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4078af372---44376398226.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c623f8d05c7db7d55cdd01490010b637/67516748714.pdfIn PDF document text
    • http://esejsc.com/upload/files/87224987442.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1250b01e---gizilunotopipuv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d01630cae---jogapodebimaxoxedozovi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/deladutejinupuw.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a16da26a29255b35569bb7e193b5a77e/dalodo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/01855b0d545cc36f1b10e71bee41a9b7/bavalin.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb58a597c---90012937057.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/fbf77808c52ce9c4a5ed5de005211645/dozadorujunesuga.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/03c26b0565727148229b1679f3e23cc3/vamalemovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=academic+personnel+manualPDF 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_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 10660 bytes
SHA-256: 5b947aaba356653b4b00b0f7d1932edeae06841f39f18d06ae07ca49b4524c06
font_01_sfnt_off000179f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19205 17764 bytes
SHA-256: 2da059ef418f02bf55b5c376d0d813df87cd3cefdf866682270bc80c7c41b215