Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc53ceb74423ea3e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bb66d6c64a9613e943ad1d0a8c9440b SHA-1: 288b3646659f55206d6f9999b96fb53f39cd7d27 SHA-256: fc53ceb74423ea3ecb82fb2c71ec814b2ef669b2cdf087f73c210de402067119
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253ef03d3a---77215423782.pdf
    • http://gmkms.net/upfile_editor/2021/files/79232333670.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/kewoxebuz.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472413f98f---42541805801.pdf
    • http://dreamscar.eu/userfiles/file/bonilinaveresobivovopiw.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/84041115012.pdf
    • http://iknow.pl/files/file/80645803473.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/75007514278.pdf
    • http://uptownherndon.com/uploads/files/mobuburaxeluzovajepe.pdf
    • http://laptopcuhaiphong.vn/upload/files/fuzir.pdf
    • https://dianthusindustrial.com/resimler/files/13330679643.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba9329ca97---tavonob.pdf
    • http://banner-ever.com/ckImg/files/59103806534.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/93hruefbifdrb0b4mogj9u4lsr/44923458395.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/7490840672.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/2116714452.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/69896318063.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/tuzonizobu.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/97503647980.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/89252854544.pdf
    • http://arsvet.ru/img/upload/49711778674.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/53497369534.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/refadojofumagepegalezonoj.pdf
    • http://juncheng.tw/upload/files/90056157280.pdf
    • http://monarchiaerembolt.hu/tmp/lalagugirul.pdf
    • http://crocepadrekolbe.it/userfiles/files/tekekuxujefalipez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+train+your+dragon+the+hidden+world+full+movie+free
    • 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_off0000ca04.bin
f3e25350a0327cb4691d3a545e5eca8d753bf05f402964e73fec2769efc78fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 18064 bytes
font_01_sfnt_off0000f7d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
font_02_sfnt_off00010ff0.bin
84b973f25bf78c38ede622f1fe2cbfc554ad90e26e4571714330639ddaf39898
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10992 bytes