Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b484c841fea2d7e…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 04:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5dfaa368498432a043a8e72785501b6 SHA-1: d7cb5061afd1bfa9510f9dd607fb7b374421663d SHA-256: 9b484c841fea2d7e9c58b714738a9e2d3a6b2e0af98e475b11e94cbc7365ed12
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gdwtechnology.com/fckeditor/file/gunigekewugilovufexesote.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/b9de682ad790dfba04ad0a5e8c470ded/71019473804.pdf
    • http://csc0535.com/userfiles/file/20210618120121_4h2r3t.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/98050904291.pdf
    • http://dobrasekacka.cz/userfiles/file/fejekapilo.pdf
    • http://files.ibiza-ferien.de/file/fobagelokepagumijopuzax.pdf
    • http://brezov-gaj.si/uporabnik/file/49741501850.pdf
    • http://www.pattyn360.com/upload/forum/files/55084897960.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/vekulu.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210609_9F47446177BB818F.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50b78b609a1e051ea0ccc00cffe0e438/dinebamon.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/85019a83271f8a52b4ef4355fd0a0a58/60176959034.pdf
    • http://qtjdb.com/UploadFile/2021/06/17/file/20210617_075413_108.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4360bb94---86618345995.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/529275d4cabc2352ebc7053272204bb3/wajafazoxevisir.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqnokr397cppj47sp5nmjeo375/74120939675.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c967a6dd59---50626586366.pdf
    • https://recapress.com/ckfinder/userfiles/files/39780251609.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60bcba0d40---fikam.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aae4d3fe3---24021265892.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4f833259a59c04a199d1275d981f965e/sikozogapefoxidesasoki.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/l61jlgcu1counbejtg8018kach/wedupivoxogopilofegegapu.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/49661831825.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e37d6e11---48921461555.pdf
    • http://lycee-elm.org/userfiles/file/vasisidusoruxosizaz.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d73ad9c6425f5f2e2ed321e963047975/63828975394.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lord+of+the+flies+island+map
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ce.bin
540f93e4b399f9dbdb455121f2afa3f4de77a08056a0c89f7872ce4ebbe858d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 18232 bytes
font_01_sfnt_off000120a9.bin
a94df6016d03bc6bc3de472499fedeaa41b346562d2889c799d9bdf3bb6db7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 10720 bytes
font_02_sfnt_off00013906.bin
70784e75bdbffddc4a9f3f4cf62d2e4573c53f5d52042b41f196013ea2441b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 18168 bytes
font_03_sfnt_off000155e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 16792 bytes

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