Malicious PDF — malware analysis report

Static analysis result for SHA-256 93474e3f973b77f8…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 22:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5557a0c32a6420e61a99c5f4150b962f SHA-1: 2ca381d391f3ffe5b8c2cdc541ad9f00622b2130 SHA-256: 93474e3f973b77f849b3935819a013dd6cb762a366f1cf44d2ebe0f12a8c7e28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of numerous links, many on disposable hosting, suggests an attempt to obscure the true destination or distribute phishing content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=dance+academy+season+3+episode+2 PDF link annotation
    • https://propiedades.net/ckfinder/userfiles/files/35156512248.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/39759994909.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/wunegiridaxijanivuga.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kibazegabanasog.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/49561878059.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/27339998903.pdfIn PDF document text
    • http://land89.com/ckupload/files/49056453982.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/nujigeki.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmmrt35mce4qnhmaurer0npbb0/10339447847.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/dopowusuvorogenerefovuxiz.pdfIn PDF document text
    • http://storemisr.com/uploads/files/16590931577.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/76282365512.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210921005732.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/soxuvu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/8821891909.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090522334573499.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/85349926262.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/debozejor.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jolebimejoxer.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/99835737522.pdfIn PDF document text
    • https://onecre.com/images/content/files/wozamidido.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/79576666680.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/59596730012.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/jakelomuvakesokaguno.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20957ec0---90804093972.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1eb3afac---3199081873.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1384a4b97552fce05d90c706a6ac48d2/xozenimefoxinoj.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/5759124159.pdfIn PDF document text
    • 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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 16360 bytes
SHA-256: 055d17e6ead12620859a3e610be9e82077c9968fbd206be8f5c4c0a0801ecc9f
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 10840 bytes
SHA-256: bd863e21e30b974e84cd12ecb931429176c23baffd1fd005772819a5f5dbbf45

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