Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2af7bb3b60f3c51…

MALICIOUS

PDF

78.3 KB Created: 2021-06-28 13:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 55ab6105a909d4e8fc072d7a2fb231ae SHA-1: 9a90237d98c45325497242bda441c8804d967726 SHA-256: a2af7bb3b60f3c515a97dc3f2d123236bcd35801a07eb5d32cd7989ee0dd74ef
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hongshengfish.com/uploadfiles/2021051814242651733.pdf In PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6f2995e6e4faad7c4f3bc670669a44d9/zolorozizupe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608db15398a6a---94061283559.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc3a643655---gujotusurani.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/92c672eq0oa9jsuecbemrugl2p/35153665335.pdfIn PDF document text
    • https://mfdesign.hu/files/file/25218222536.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/gomolajuronudevabulex.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/segugobu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48b758a87---19570042452.pdfIn PDF document text
    • http://darec.sk/files/files/sibusa.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8058beeab69690ac6f73b557f64b4e3c/lowajurilogawetufutu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/49314727634.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/57330721285.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6e67bdfe20a4e0676a20f39f9f774147/63931592775.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/644a99e7a0cf4684db3841d9b98b9b15/xozezakomeveganekebo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kezegus.pdfIn PDF document text
    • http://amdind.com/userfiles/file/84324008068.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/64318769771.pdfIn PDF document text
    • http://adveotec.com/img/file/6319753704.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jg9nofd1ktapfjaqcoqqgs72u1/61551032602.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/8726148555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+insectivorous+plantPDF 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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 10600 bytes
SHA-256: 7b1d52539490bafb64a453b3bd097ca3bed695976bbcd1b83315c00a2ee11b4d
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16520 bytes
SHA-256: ff863a9cce5865c46cbed773073cc064634c15d9ad97f89604bad65e966c87a5
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1