Malicious PDF — malware analysis report

Static analysis result for SHA-256 3342ac777e7f28a3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 20:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 305298c294929c0e094cec543faf0c8c SHA-1: a605893d62a2abcb34b563419307d41a6912c0fa SHA-256: 3342ac777e7f28a34f7ced14ee2c4fc33695f4a5c0b71fd923c61be019afe8db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files, many hosted on potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://futurefacesnyc.com/uploads/file/16814358414.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4da3llqdp5fbcsk6ot4u6q3rcl/fubas.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27650029089.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/35350927997.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/24792515602.pdfIn PDF document text
    • https://braus.uz/images/shared/file/zogus.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/petepimadajidekel.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/jiriju.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/wezugozifinafip.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/71626322939.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/gujuvetav.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jewiroxezugalonazinizipu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144caa8cca01---zapoxegaxetibif.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109030148223422.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161315898dfc05---55186346006.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sarisefufotezosusijoto.pdfIn PDF document text
    • http://checopharma.com/upload/files/53094962478.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f17ed254ac2fdea82d50e4a691561a/womasejaweletanuw.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/megibixazixukobi.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kawaluwekapenuxabedebogek.pdfIn PDF document text
    • http://weshare.vn/attachment/files/xeridoposugugos.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zavobavepidivesuz.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fejoga.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/55828357009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=merge+dragons+mod+apk+unlimited+everythingPDF 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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 18280 bytes
SHA-256: 1970cdfe15d6289777c07a5fc7467720e588a7eb0906b467d655b749b0e165b2
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 11204 bytes
SHA-256: 1404321c84faf2d1a05edbcdaf66b36ebb0cc5f08171b623498bbd0544c942ed

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