Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f0aae9ffab74bb…

MALICIOUS

PDF

80.4 KB Created: 2021-07-14 08:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27e2e0ef47149731fa9df2cca1836532 SHA-1: 86ef5d066e1c36fddfada3040dc26b996c05b631 SHA-256: 55f0aae9ffab74bb9f9381aea7bf982e60e7d5c122b29bca81d281f5734c28c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites, likely to obscure the final malicious destination or to distribute further stages of an attack. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://royal-art.pl/uploads/userfiles/files/74027548822.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/aa6d2b5e7a1dd17ccbff3b0ae33c88b7/73653932192.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9584f8e6c55cbe20c3c3164c0fd7a22e/zovumatapupeboxikekuragov.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/16255154994.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be962d32a---58716111315.pdfIn PDF document text
    • https://allianztc.ro/files/file/60489539296.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/58676271782.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/98694953013.pdfIn PDF document text
    • http://armanetti.com/images/95606869214.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bq8mj802u9p5tgk4vi9cp1fs06/19079927291.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/71002207502.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/npni2aitu9rvoqi7lt2mvjk2cr/96247027664.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/zumupumizu.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/vixawuwaxasinim.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f0d4b88a---24053968357.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/53713209684.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b730775635f---77708174646.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e982c5ea19---30136132354.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kakjdn1sgd8m22uk75ehocq7ot/pagazumiraretivavix.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/95371019900.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/46771103702.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b76ae88974dfa38f44168eb3ab7b289b/18319478358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+picture+to+rememberPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/71b8768c026a45acb421f9a9880008b1/monikuro.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 5808 bytes
SHA-256: 0d3d7830c69a76e08a600245bf2fdec78d27a181a4d52f77b3c1de5812f0920b
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 17500 bytes
SHA-256: 0639ca74dcb55c2f25e3d94afaaab6fbe9156da4859c1713f0cbe6cf72e85b2f
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10276 bytes
SHA-256: e4a32a31739ea4063cc5f2e4386815f5525fca68e8f33585ba74f03cddc07b2f

Open this report in the interactive analyzer, or submit your own file for analysis.