Malicious PDF — malware analysis report

Static analysis result for SHA-256 416eb3e5a1c691fd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 18:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 616cb490a5d5258bf072883be8af430d SHA-1: 3c1498ec73b1cb949b318056c29e1546ae8f1033 SHA-256: 416eb3e5a1c691fdea2b34e25df31fd3b4ef72e591ac6a7f431e3bcac42bc5ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pawopezozik.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0tp4kpoub73i5ka2pbe01alun1/86992579885.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/vaxarin.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090113352789.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/26129246359.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16427350602.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109011338404679.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/51fa17266ee43e29925bda619338eeb5/14670669228.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5f34b379---48013389280.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/68915598404.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/damepazizixupaji.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee6788d0c---lukesoxidilesa.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/jazenigewumudilutisarefog.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/21292546666.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/mejepuzapipoluvaw.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/bikoroj.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45573677021.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/70703929095.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/29943440268.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167bebc894---45471472790.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/fewigisu.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/63156484814.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kanaxolinegixejigumav.pdfIn PDF document text
    • http://generaldistco.com/images/file/44079810036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=thoptv+premium+pricePDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 17880 bytes
SHA-256: 8b7e11260e3f472aaaaed8b05d1e0cdae5b3e6187fce5c0b489635dde92bbbda
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 10288 bytes
SHA-256: 9eb358d909d5ce67fa3c3d46ac9548dc47fe1be6652224b83f757f41b4865cf4

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