Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5fbc5c9ed45bb0…

MALICIOUS

PDF

93.8 KB Created: 2021-06-30 07:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5396e9e691e31f87eba0875b1aad4c0a SHA-1: 8f90e0c1d7e78c875e38e5cb0c819586edc91300 SHA-256: 6e5fbc5c9ed45bb03faba4bd9bd8a0af1faa6a7d7c7b76c589506f5e9baf330c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure suggests an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1976c7189715b4ffc43827559615fb4a/95171625952.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf16ad8f8ac---kesilozonoxivipanut.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/02ia70ic3n2ed09hm6fnv4t36c/87780350036.pdf
    • http://zabradli-znerezu.cz/userfiles/file/lewinepumi.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/is38ae30uc7f8tabi8qarmks8b/kopagumamumutalugesovem.pdf
    • https://alnahamgroup.com/userfiles/file/buxewuxugabapuvavagade.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099466edc008---2641030372.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/8693842829.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ic3ru325hqbkl945r23s84f594/3539245715.pdf
    • http://vitanova-cattery.com/upload/file/katef.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a4bc1f55caae381faa493454038704ca/popidojep.pdf
    • http://shukokai-voves.fr/userfiles/file/73731584177.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/xojuzefarezorutikakifave.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8207f944cc29662548b006e12ea84d10/niwaz.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tkdb2ftvd75sjtg19kf5ei3853/77824222764.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bb4c906f89ee47f470a6fbd7dfdee12d/87891176921.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbefd7e5760---8396346658.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa92d2e175---45830396794.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5f5ac1ca6caa82a99eef545c815fc26e/nisavegijitotuna.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5349c5ba0cde385cd329aaa1eec8217e/82192142273.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2809280ef---35282412868.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f96099df---lufebigitipuzezuniba.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9cb9cc03---xurajepowisojudotumiwa.pdf
    • http://asbufestival.com/uploads/FCK_files/file/pikotomusijof.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e14cbbd2e829f2c410c87a9ad6143d1/kifigujiva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=do+you+capitalize+words+after+a+semicolon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16792 bytes
font_01_sfnt_off000122ad.bin
947b996205715deb1602cf23ff6353fecc7beb763ac88f4ad2dc769839f4a13e
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11140 bytes
font_02_sfnt_off00013cd0.bin
844df210828f3e40bf74c1961d2bf7ecae234654e79f603fe175ee6b0e4dbfff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 17336 bytes