Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6d2b4b56cc1a6c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 11:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a95fda661c5c579475b8733fe2914d07 SHA-1: 88de46d8c81bc2bbb4416a98b4ac5eadf7ac7f21 SHA-256: bd6d2b4b56cc1a6c3417efdbb83f60ee42faa51b8c7ed99858129b06eae83140
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. One URL specifically mentions 'counter strike go download for android', indicating a lure for game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://zygzak.eu/foto_dane/wysiwyg/File/42443077548.pdf In PDF document text
    • https://ajur.rest/uploads/userfiles/file/zulumilifufej.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/19006883035.pdfIn PDF document text
    • https://heyratacademy.ir/file/5415657728.pdfIn PDF document text
    • http://cartopack.be/Images/file/53114414495.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497154713---luxonewitinogater.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614197d896146---vojanekurifaja.pdfIn PDF document text
    • http://artediapharma.com/upload/files/zusilutisomaturot.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/32529067209.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/ludefu.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109171004505164.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/74182486328.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/30030844371.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/potedalevorivibiruzisu.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/jasupelozosa.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/bifazezujuribuwisefaromoj.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/buzodozijag.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/20059566527.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe590d8c70---78726865052.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/19272316581.pdfIn PDF document text
    • https://premiersuli.hu/files/files/mopidivajavesor.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/39252122785.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326681d4ffe---12562951849.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/43161789664.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kavibuwokojawun.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/52183669135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=counter+strike+go+download+for+androidPDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 17076 bytes
SHA-256: d8b34141e84a61c4f3c85b9c4dcc31cbb0edc30dd5cc2940f97edeff5237cd5b
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10840 bytes
SHA-256: 9b7dbcb3a92756a38271fd7161740557ed537efe46efae1fd39deb5943eaf5c7
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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