Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfee00649296f278…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 02:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d142bcb38aee8c3c3fafc557f7dea2b SHA-1: 9a319cf55267090b09ef60fb8130648b3ebdb35a SHA-256: bfee00649296f278e0f66adeb0a47629a68b434371e4cc67ff555bedc8d82a15
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.privathospitaletkollund.com/ckfinder/userfiles/files/68458651454.pdf In PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/78113132242.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/javerasejiwixelumovonorol.pdfIn PDF document text
    • http://rideco.hu/upload/file/59298590338.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b00909d---31924886582.pdfIn PDF document text
    • https://mkontakt.com/dat/file/4118991190.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/7180787276.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gasabetegajaxane.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/9648290958.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/82941573582.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/pekakejimabixitudadesuf.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/vokuduxefotabo.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/rejofagunapafubil.pdfIn PDF document text
    • https://funke.be/data/file/30374770943.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mozipukumuwafutifug.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/86418633226.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/dexaxid.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/72262008837.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/87839004544.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/25825174519.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/85299262132.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1041f2ec---donugowurasubodapubutuxal.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/780ee9b8dfa1f343fcbd5249659d32fa/joxisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=quiet+place+ytsPDF 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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 16624 bytes
SHA-256: 6e3d6fb00e35c59156c714f0df5f0873c6e22a84da33b0923e8c01b175f7c7db
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10316 bytes
SHA-256: 9eb521fe654a3e32c140d2d36968721ebe012af813c38642c2024901c153a578