Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f63eeedad460035…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 22:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ca24571e7f4e5e9dc0ea20ee6493cf SHA-1: 4664afd5b2ca435cfec4f76c682efb0b1ae41465 SHA-256: 3f63eeedad460035f5beff849816b5ef6627f669b56bcf540186c8311ae209a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF structure suggest it's likely part of a phishing or malware distribution campaign, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609762c411742---96579880268.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210506215833_522154689.pdf
    • https://inverpalmas.site/aym_image/files/5493714154.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c1c2de697f80e8f7dfd42c0a61a0a16b/bofekimuvebe.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/oh9t9tosllr5g6agl0vkji94f1/dumibafaxobopog.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cj8iea4c633o53vuqf3budqi72/jidudipugatagiranemed.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6f145dc2d8189e5a21562c3a2579c544/90336997575.pdf
    • http://naturallabs.de/userfiles/file/maxot.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbf5258bb---41159169946.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebeb107189---zisexosovod.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609276f58119a---disawezixo.pdf
    • http://nsdadventist.org/FCKData/file/zesawuwer.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ompbapg9v9vkaq9npiq2tq3epu/79098324049.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f81c955f---narari.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/408afad2b18e0a3ad2e64052e85b968f/sutulado.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/hnn0h1u7nk6lnekuob4l4daars/zasesugesuzovobinawi.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/08258439e223b722a4d6096af53a28d2/fofuxapenulajufib.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/41cba86c169fc5f59414ad9f3780d5cd/5131443218.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608312b6cc2f7---vuwurozixami.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/aa9eafdf48ca92fe5a22f5004255d132/refamujuji.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee02b5efa1---fusumikipabun.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47323645655.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ha7mec612pl1lpe2rmade3lr67/lekex.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/bd4ddf8f5502f8739f1b6c7b329e2538/21093187592.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007756ee08---sonazulugomej.pdf
    • http://afghansolar.com/userfiles/file/39320353462.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=api+interview+questions+for+testers
    • 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_off0000ec55.bin
97db02eab4ebe44262a089d1b2caff27b1b951d5ee1fd4dd9823ec40925f081f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10524 bytes
font_01_sfnt_off00010489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes
font_02_sfnt_off00011c9b.bin
080c90acc6a868b83d96a0839e70749bac4077506076f8af24c357e712ead9d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 16616 bytes