Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5cd7ba185708cf…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 05:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b0ed78cfc7b7ea3c71f15eb3477e175 SHA-1: 2cbbac3ce0b2b2f2c89ade92231b1b8901435080 SHA-256: fc5cd7ba185708cfb5bb0abbd9c239260bd325a3a4d3443adc65fc276e8953b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by masquerading as a legitimate download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614597738f5c7---wabipijaguwupoviwezupupu.pdf In PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/76018702190.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/63r3psaesu5g5me7cu4vdj0r6i/65377999249.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/33703131691.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc597b306---xaxuvopa.pdfIn PDF document text
    • http://prmakeup.com/Image/files/94985226833.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/pasinutalurarefegode.pdfIn PDF document text
    • http://aurora-c.jp/files/files/3415464186.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/68197128530.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/86443956474.pdfIn PDF document text
    • https://ms01bet.net/contents/files/38328762948.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/duzijonafefoxaweti.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a10ec374a8---91617541064.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/xetigazemazoniluwa.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/18919992332.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/32740148603.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/degenerag.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/83969970125.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/25736650468.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/10409759669.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd951bc86---61076866440.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pabixeminogijekipo.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wibak.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142494500c4a---96183584207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+galaxy+j6+firmware+downloadPDF 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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 11372 bytes
SHA-256: af912ef2bd5b0c1332a1d6a7b1dca627e86454a32eba6e01660e02334f834142
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16832 bytes
SHA-256: 2c7adaae44956e5bbbeeefc7347c24ef892317ee837e6249a054c9759dd2c74c