Malicious PDF — malware analysis report

Static analysis result for SHA-256 b490cc2cf37d5eb8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f935764d5fdd26a820713da865ab006e SHA-1: 04679042a16a9d2267e6a91e878228db5cd1288f SHA-256: b490cc2cf37d5eb8110103cf51fb9ac0984c355a504245b105f7bfe984f1265f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URLs, some of which point to compromised WordPress upload storage. The primary purpose appears to be directing users to potentially malicious or unwanted content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nnkcreations.com/userfiles/file/pusosirorumivulitoboti.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/befigava.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/04be82e884846868814671cfa8cdc55e/tebatotero.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/gumanubexibiw.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c777b7b45ebe9a09284184620b874a14/47959073232.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ee7gribptb5bv5mgnq412p1p4/75408172512.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/29431838549.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/40105952554.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/22698893983.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087951d87c4e---gotopalo.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/13622121021.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/gqk40ljbe6me0j50dh7s3a5ft2/wotozukowelirukegovejus.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/kutamubirudepiz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e32e86853---3408970863.pdfIn PDF document text
    • https://steammining.com/userfiles/file/pixodobomosi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/04896bf981e7e11d8b0d796eee9fbcc1/jejetuwulaku.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/kinipubapuzipiso.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/fajinokibuguligeliz.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/97432124795.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921cc9f225c---tawipegigekarinus.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/v0v3ijj5c0ae8lrkpipkiao1po/juranirejusul.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/73c5bd21bcf76f7c84882ae113850b88/joxitijomela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=varicocele+treatment+without+surgery+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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 17412 bytes
SHA-256: 5921f460f651fd74c90577a4f72a7326ad4f292800583ace07dc6ff0b8c1f08f
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 11336 bytes
SHA-256: d938a87e7a25eb06df5a594436d78ac8fffc9331f428e49ab8ba1a16608bf59b
font_02_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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