Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde708add1e12bd5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 91c4bd5395974b5642887edacb8c96ef SHA-1: 9a6d700c10a41a7a504677411b1d030d5421391d SHA-256: fde708add1e12bd560ebdc814c10f8365d5a00a89be9deb496fcf53fbb24f92d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be disposable or compromised. This structure suggests the document is designed to lure users into clicking links that lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://osstemcardiotec.com/files/fckeditor/file/2175277861347718bb77c.pdf In PDF document text
    • http://net-marketing.hu/images/files/77242049740.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/12177477268.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/43711506296.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/godesasunofutubijus.pdfIn PDF document text
    • http://espwireless.net/uploads/file/wewepunoram.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/21196247587.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/5031723135.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/54921603939.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nimifelupokev.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/rejutifawobovobad.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vafelebusagojesoxawi.pdfIn PDF document text
    • http://texmet.pl/userimages/file/zoliwaju.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/90555013997.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tutaboparesiwu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jjvjnfijleigmh1l952urk3d6g8bbsn8/86913225729.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/buvuniwo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3gr9hg43er584rn5bso4ot6nsb/xuritosoxobidi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/baruzumu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132465ec596a---51892962833.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/jagoka.pdfIn PDF document text
    • http://medrea.ru/upload/files/19459938707.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c96c4afd6---deragunezuxarilalakepegaw.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/loferurofapot.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/juvomiwagif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tekken+5+ppsspp+iso+downloadPDF 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_off0000b780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 10460 bytes
SHA-256: 9f7a471fee42d844d27e6949b998b61641c32b44fcfbcbe984e0412bd1bf0175
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16564 bytes
SHA-256: 66650532316e7f935344412067e2197f2819bf35c43cfd725520aa3b60618446

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