Malicious PDF — malware analysis report

Static analysis result for SHA-256 1183e1a409b3b3a9…

MALICIOUS

PDF

83.4 KB Created: 2021-07-08 11:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4a36f3fa5b8e6d011c423259fded5a9a SHA-1: c9cfaa82a321d70817453a16b1b81901bcf5aff9 SHA-256: 1183e1a409b3b3a90d04b35c53b1bdedc122030c882243f81851f863a227d8b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it functions as a link farm to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ediljolli.com/userfiles/files/ramuxevoxifefipavof.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b12479a36ec---nipobokipiximi.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160925ce60e961---koxoredesunirawu.pdfIn PDF document text
    • https://majubesar.net/contents//files/89792752152.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082834b6a749---rodovexipotarip.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jerixefesolilifu.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/kewasinijinipodidoxuz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895f79991ce---11310857546.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/20694723159.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf8f04ab5---84874837278.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16219771937583.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h5h9fdv6pmeddvamh0l9bss141/18381387940.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e0uirtregdkmllh1cla92p9v3d/710752388.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3163ca39ec---bolaxokebozare.pdfIn PDF document text
    • http://slsnn.ru/content/files/20078635790.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/17994925089.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/2663870140.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/1892354013.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/91689669772.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/721f5ee75d6fd6237f3a3af6c9f7bbd3/20718695792.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d775a1kfi2m4sjadcfjlrqnuhr/68306530510.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2fbb7e33---jewolojudat.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15882818430.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b31228e0ad5c5c97f586d728ef0839b/moxogafotad.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/80067254076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=different+types+of+graphs+functionsPDF 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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 17148 bytes
SHA-256: b85d4caf1608ee74ad318bb8d67b237e11d40f60120b90e91ef2e3589aa2b865
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 10928 bytes
SHA-256: d5e9082f1c4c71a628af1249f3dbba704b27c45e92a7ff234c7749aa716d650c