Malicious PDF — malware analysis report

Static analysis result for SHA-256 48612303efe64758…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b8fa16e978cf8834bbb409066385ebe SHA-1: fa82f22f884c7fc571dbbd79a679d25a8a3bc792 SHA-256: 48612303efe64758388385c510b1f8d5d804c50ab28bce7c35dd8800ac6ccc68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=cominox+stericlave+18s+manual PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3297347547---bewuzoriruxavi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6d74f53264f27a965d0223b437f8b189/84200846858.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/bivesu.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/gemitovakuxal.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f29adf0a---pixuxuzefaxe.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vibipoxuvix.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/51700551411.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/feserimusepejap.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/79851709450.pdfIn PDF document text
    • http://kco.su/userfiles/file/julavoxiwozuladuled.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fpquc8uebj20l8huks4ecknl92/gufoviwabutagusapifamo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/didorezojasukumigit.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/79498810023.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/piwakudasipemonefax.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/44651219059.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/45581526620.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c7cu4r7tnbseq2iootgbqjsjer/36083715322.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162583814295678425807.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/84927076656.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/56603282435.pdfIn PDF document text
    • http://primaneighbors.com/userimages/rofufutanigepezo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i8kitg8vu8cs029u2fnb1s4j8v/93803178545.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gixumudiwuzojelefalot.pdfIn PDF document text
    • http://cwesp.biz/upload/file/67940934841.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160828a78541e7---42761206416.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10948 bytes
SHA-256: 46bdaa4179353ca3bef3c4bcbd1a38e68a23f0cc67fce9632d86b0b2f7c3aaa3
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 20268 bytes
SHA-256: 00fde2692b91d29dcfa8be97b16183df258e97e1d4606429926c1e5f976da619