Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff24323e7ec48d7…

MALICIOUS

PDF

81.3 KB Created: 2021-08-06 16:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34ac4fd6ec57941fbb1f351147bc866b SHA-1: 8c52ac0a5d7f09319e326d15e3135f435f1cafbb SHA-256: 0ff24323e7ec48d75378e6acb9b21a5f327926b273e6b3276502a9b8ba837656
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5ae613d7d72ab0fea30d1b6d3cfb6475/93623170011.pdf In PDF document text
    • http://allycatering.com/userfiles/51687433261.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fb550279f8b0ff78a741592db396dd47/dulukuz.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/buwogegamujamufe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekbin62of31sner16n8lngqo21/nejogezivanopepedijo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bd358904d9244200169afc76d8295f71/bakofuwanix.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/mavebomugeruludakonemado.pdfIn PDF document text
    • https://aashianarealty.com/file/45296738193.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160baab5e7f990---22480485848.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e4f069edd5d734b5e71c16f89eb2fc13/18868888449.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaf0fea7e1---wezemem.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/45346745532.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a857288c0e5289e3424751fae057c5a/78516261964.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rd8cd59q5jv9cr5tcokh42454q/vovesixidimevod.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/gqk68vfpiqea9q0ovdqjcb3hs7/tusirukexovotinelebaram.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/aed3aefa6636b7a3ca984e651b0178a8/dumikuminuzesipim.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa476e3196---41027618678.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/31718634920.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d51b268c---sukokemolibevedawozag.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/topuz.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98841f54c---88297703933.pdfIn PDF document text
    • http://lyshiying.com/d/files/zamezapezupovawudogitonaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=co%C4%9Frafya+10+s%C4%B1n%C4%B1f+testPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 18520 bytes
SHA-256: beef0db18fe3e18af36ad34af53fe2d31c68fe3e76204a62772d8d85e00e1828
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10668 bytes
SHA-256: ef059b2a7cdb2031db0a37737fc5aa2a38c63acbeca43e0d93f8ddc4d1972b6f
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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