Malicious PDF — malware analysis report

Static analysis result for SHA-256 786bff81cb48b970…

MALICIOUS

PDF

94.2 KB Created: 2021-09-04 21:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03605d62a05249c07ab148083bdb88a3 SHA-1: 99937ebb340b66cd144e74878080114273e35c26 SHA-256: 786bff81cb48b97010c0dcde2fd33b96102ffee58db66f2b30887cf34c985b7c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be directing users to potentially harmful content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dgkag88uqvm6jn5b9hginipoo/27923073193.pdf In PDF document text
    • https://cpsguffanti.com/uploads/file/damawodaderemutavuwe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608791291f04a---jaferotozojadodunixeboveg.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/29529609291.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/gokurer.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/veradamuse.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/62362259612.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wutozonokulonudexufiluzim.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210808063059589336924.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/ririsigimu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/53095201918.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/xajubasemejixuwubefige.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/sejigugage.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df56773762a---loferimikepobumupum.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ae02350a7dd00e75ac266ac7785731e7/labodasalapuju.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3nh4brvblo9mjhb491ushldrr6/65873416666.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/53331669090.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/juvanegavotaresazel.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129bf850eb14---68003172672.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/88014174616.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h3fobv3oscjathsc3l38kh554d/66938514518.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7ceb9819fb16c79f3db855bec963fb10/kikaxawubez.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/20339664744.pdfIn PDF document text
    • https://tckontrola.hr/files/zukifodevomedudinanozem.pdfIn PDF document text
    • http://fygl.net/uploads/file/280848414731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cybex+arc+trainer+525at+manualPDF 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_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10844 bytes
SHA-256: c25354982ea563a252a881ff753dd7beff1e9bdae866efd096a5f5d987d69f27
font_01_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 19012 bytes
SHA-256: 4a6060de9c24a3d8df64b0108e208894e24d52ff4834e49aa15cf62612652ad9