Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d9fac582883931…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 01:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6261282b6ddf0c4f958561856728e28 SHA-1: f2b9db5554d3357f310cfb10a46f0ceed1a47abe SHA-256: 49d9fac58288393111367dcae93be9bf724c8c85bd53e6bcfc2a29f7c05f09f4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dvarl2q177plj2nbmrrplk8nal/36934972953.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3058988ca7---kibuwamojumofisuwirogu.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/ziporovekadelo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/wisukapuxu.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/68751862186.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b5751b9c91b17e9b527171500a26d497/24281476092.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/10535094052.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37f84b7e6---97014702942.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vizemewej.pdfIn PDF document text
    • http://coumert.com/images/file/degem.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae647a5691e---75407107394.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/ziriraxibizusoloxuxuviti.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/17755178208.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mhgfh64le7lh1q30d2va3skkhf/34629140865.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/68544308285.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/moteravozexuv.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708702b2348---bagem.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/34725689195.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/gasosaladozesi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5kuh55b66l56nkovqsmf30tq4/xawis.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/paradumilaxoputaredefeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=l%26t+mutual+fund+common+application+form+pdfPDF 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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 9032 bytes
SHA-256: 76eb9bc0876d8992c1a4f469656a194a5051785caf149127922d177b1cdfc18f
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 20900 bytes
SHA-256: 15d53befe7b90a30f2345a64838d74eb7ebc366c7f67723f7bf4328a6b397df1
font_02_sfnt_off00013119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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