Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b5f60de0123a7b…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 22:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81a472904a62b41d7be8a991cb4769aa SHA-1: 105c644fc830f7eab2fa979f7270140a1191ee99 SHA-256: 75b5f60de0123a7b5a1a7632da63332e7575d57cacb675190ccaff1fd1595965
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://bodykneadstherapy.com.au/ckfinder/userfiles/files/22501913146.pdf In PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/41006440264.pdfIn PDF document text
    • https://andrejc.si/files/file/kojifa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fafe262bda1---33003348622.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/25292152275.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f978b626439c1519eb342ad0c89d5cd4/54822529525.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/11678576760.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/janenuxofasoto.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/13383574801.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160906633c9189---28444434647.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edf72bc01---50002118613.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/ketutirefakunumojezaduxi.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/20134570431.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a618cf793ec---11188576520.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/19715790679.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fiweta.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/baredafojakiboritune.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210625_183022.pdfIn PDF document text
    • http://wernitznigg.at/files/55257107699.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0e2e4jomo8cf38ulrhamnoc778/wabiravevopirenej.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/83711811633.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/54b5e9da9b5d81c9500ff7faaed29987/liliwenedipemewip.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9bc0f01a---36812004209.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ea32fcda3f6e72c48513c7a4321d1fc1/ruzupanopezolugakudon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lifestyle+and+health+pdfPDF 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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 16308 bytes
SHA-256: e5ded226d994d999c5fbe576d35fad2edf26df927ddcea13b1ca9e1f0f631cea
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 10444 bytes
SHA-256: 18fc440429a7b23b4b10f8d60fd217ac06f44eed1ddf45b5b63712532a6fb3b2