Malicious PDF — malware analysis report

Static analysis result for SHA-256 524ba784fca6d92a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-05 04:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613f2a0e555f762c0e7d101f4c639a01 SHA-1: e1978c9721d85cb3538b395485325926e629a08b SHA-256: 524ba784fca6d92a34f801934d1d2020bbe212dce4d0a1568a38fc3704f74cea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b4be54157c3710c03292d2c436a3f1cb/kisepadaxavif.pdf
    • http://logtech.cz/foto/Image/file/semeral.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080995062533---14343763395.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c1b33721ec7f662fb4bd86ee9e1a86b8/84820913451.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd2aeaf8a0---85848275016.pdf
    • https://gizaviation.com/uploads/files/mevubumeruzazufiva.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a181656d---64332388027.pdf
    • http://esejsc.com/upload/files/kozawop.pdf
    • https://dailyhondaotomientay.com/upload/files/12738997627.pdf
    • http://abpaluso.com/upload/file/55057659063.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c15f388eb---14457598810.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6n59f76dgi84rbfl05tvenp10c/ruxofilikajamoma.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c260d7a8e36---49710461390.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce30578207a---69161568693.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083765b7f5a7---63949494721.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607284bd097ba---lifibefumavinika.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69230ee66---43932508456.pdf
    • https://agentcctv.com/userfiles/file/girowadi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3650a7087---33058629969.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9a3eeae507046f3b4bfd9922822c3133/jilebuvaz.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/90486557732.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbdfb369fa---37794571380.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/a2d300768874f0bcb67d026d23fa8fd3/90369014714.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=comprehension+passages+for+grade+4+with+questions+and+answers+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86598562aabcd56806e1b6e6eb9ab5e6/16833148453.pdf
    • 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_off0000e916.bin
8e5be16e49e06d97afd25b21446d290fe26cc5c774eeb654e2513a45054459b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 11340 bytes
font_01_sfnt_off00010333.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 16140 bytes
font_02_sfnt_off000118ab.bin
cd7ac002c347978303a4de4e507947b827853855e48b81d493123df3cf0aa64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16856 bytes
font_03_sfnt_off00014419.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 16792 bytes

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