Malicious PDF — malware analysis report

Static analysis result for SHA-256 a482f238cb3b4006…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 11:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c06e5fd25470bf0f8811d775b8a4f4f SHA-1: 87dbef098a5056e8fc44581300416b61f0a7774e SHA-256: a482f238cb3b40069945bc6a265b2d4274b3545c65e51153b4b028f2804421b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41e5c452b---93803418713.pdf In PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zavijijatimexemiduv.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050732363015.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/51235063472.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/35006316531.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/runaxarobosajime.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/tadaloxumuma.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/61323289718.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/19070977894.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/34343706760.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/safalopituxukilewubabipof.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_26BBC2F733C2365B.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb07b0ea56---mupewod.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/radesaxuvupimiriru.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07ba5280a---28091500258.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/disivurozurisa.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60445544321.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/2661001107.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313975b3781---66453802128.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210916192134.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/redikikesomewolubeturinaw.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/fegumekida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=imani+the+chosen+one+book+3+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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 16580 bytes
SHA-256: a4fa6fc4b560c8e2398824d1860605a284b369c9c78ab083b5b67647ecf5cde4
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11092 bytes
SHA-256: fa9da9d0b6d6e9d8ab541dfcb888c58dac632f518c140c48a49a341be41375dc
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1