Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b2c8ac5a53e067…

MALICIOUS

PDF

76.6 KB Created: 2021-07-14 02:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8abd7c0d521bff5b2dd18c8815d56ab6 SHA-1: be712f0e14fd71ed4eb6870ebfa2edd72f309eaf SHA-256: 43b2c8ac5a53e067699244f6f28834bf1956bb43fbfbaffa356952ea35cbdfa6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22ad36211---vivelepatu.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/l01plrkkmt1karkt0n75i555fe/narewi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/xegasilagafejepamaxi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/016f7799b996479954d7c751427f7486/21979367211.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859082864f9---kazemusukijezip.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa47ip55kek0gfrg3ii91rl884/lipomibatilonexukigipax.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/dexigonurenuwurake.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/jiguwevixepugawawege.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e2751faa8620f25701ce0013da79a3f0/80357565576.pdfIn PDF document text
    • https://tepihtrava.rs//files/durajujatopoxojijefe.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/pomumul.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210709_172115.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607642d9a7f34---80152186281.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5bd57f94c1b0cacd36a318e3f8a6179d/figuluxipinekipatavija.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf7c4e734---nivoxusazilexipufamewav.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/46620202840.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-10/images/files/wijif.pdfIn PDF document text
    • http://firegallery.ru/img/upload/2632394383.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/39292034775.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/15ae8a2f3504276beb6710732b5d2016/64584417637.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bufidida.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/jarezifogabametiso.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lo9fuki9f56tce58b5rkvb23t3/63628150357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mens+winter+hats+scarves+and+glovesPDF 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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 10796 bytes
SHA-256: f7970af0219fcf7c9fec8aee218745463b97463b732d62fe20c4bde5f4bb2916
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 16600 bytes
SHA-256: f1adb2b077fe22b472dc4aa929ed3a59ce4eff05c5099ce3815da44441bde14b
font_02_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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