Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad797a00729cce…

MALICIOUS

PDF

166.9 KB Created: 2021-08-26 04:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97b29e8b83f35a65ecc87b7d368ee47e SHA-1: cb926c9cd71cbf4c08653dd25a21f1fe232bfe6b SHA-256: 4aad797a00729ccea0ff80738b721462cd49653811e4540b7b247afc81bef428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and using UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://sbsinternationalschool.org/sbsisnew/userfiles/file/sirovivofomuwolavap.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717aabcea70.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/71839934799.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70eb7648f9---72933102991.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e976a3927---wijedeniwudazobuvapi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/josuxatenano.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/27409027262.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/bosunosigexupozunis.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/rirejixopap.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c55930803---28652482680.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64455264535.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/2684655627.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jt91ajdp1gd2b760p9biih2vu5/26341432831.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca048f39f---28387203700.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/zitujerosowosul.pdfIn PDF document text
    • http://tahyuh.com/uploads//files/202108081844243719.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c29907e34---juzuwimojogetazug.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf352b05a---32426696971.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/68326677341.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e22e37bdad9---bojidupeniwu.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/54743078126.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/20743887917.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/57483513994.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/99424017598.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c70ec4f2---35951740446.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/88207321125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=list+of+herbs+and+their+uses+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_off00022eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EB0 16984 bytes
SHA-256: f6fafff30742dce8f92ac5a6a0cefa7b21132f34edf800b7d49260ee2bc47606
font_01_sfnt_off00025ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AC8 10744 bytes
SHA-256: 7308c52e90e6c5cf713cbfac662e61fd9a2bc44e7b367b5d137d71eb9f0c354b
font_02_sfnt_off00027337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1