Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4184b49a288ed3…

MALICIOUS

PDF

79.7 KB Created: 2021-08-04 23:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70c9ee4ca8ddf80b7972c30792a27889 SHA-1: 591c2e84bcdfbcd727dede52e111ec8fb227011d SHA-256: be4184b49a288ed3b14144e90b29c03b1eef308501762af06f9239ada253d926
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/56acad4e42e69de711aaf63534d50c38/54469522972.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/29528144874.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/34595372078.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/51671434590.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/53080937391.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lobinifupafud.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/27497298333.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/luhk89c1rq2bllcog0l9n0rrnc/24802990333.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/52533543407.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/18288654700.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161041c3b5c534---78489706335.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/53200321866.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3cd3265d---lebinirokupigufitesa.pdfIn PDF document text
    • http://dzbnf.com/upload/file///koraputikataju.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098af9349924---13043019783.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ff2981a4fa23a0fa3a9c3053c1a5f2ea/37928970018.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/57637328025.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/13281173092.pdfIn PDF document text
    • http://emannsltd.com/userfiles/25408490936.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/xixosepupowemi.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/52431298173.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2r5bi7n2hnisqpkq0puol69qk1/97331168596.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/thhnvv71ui0vjnc631cej487d6/gumusademek.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/60711846415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=blaupunkt+dab%2Ffm+digital+alarm+clock+radioPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 11084 bytes
SHA-256: f4baf3f16a8ed92568c8a5fc134d24295fd38bb443c57389fb35f14622a4fcb3
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 19420 bytes
SHA-256: b5306837ca10006b79e73cf83b2fc6a1a69935e75bc755cb890eb78bd7d898b6
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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