Malicious PDF — malware analysis report

Static analysis result for SHA-256 787e47af94cf3ae6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 10:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd82081a5549664faa4ddc7b71eb0b99 SHA-1: 18113a266d8778743eba18ce1724258e800eb0df SHA-256: 787e47af94cf3ae6066a62bf10c8ccf3f730937de6ad8d616723b7c88dc6cab4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and link farm suggest it's designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tech-sub.com/userfiles/file/66815660339.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/99995159889.pdf
    • http://mh-gartengestaltung.de/userfiles/file/64173346332.pdf
    • http://1-sanya.com/blog_images/blog_/file/kadixajujupaxeduvojol.pdf
    • http://france-ex.com/images/blog/file/tajuxekafeladaleparovat.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/38f56bee763df29ce95607e5ff46061c/18516178360.pdf
    • https://indiansabroad.uk/userfiles/file/zarujifejefisuno.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613be06d301cb---4565464372.pdf
    • https://ltes.tw-goods.com/UserFiles/files/340627709.pdf
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/wirerevexodibagumefagajow.pdf
    • https://medbillings.us/lightspeedweb1/file/gatekosep.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/927ac9577021d345aef1680e261ed56c/98278140708.pdf
    • http://marcth.pl/media/fck/file/pivubedosu.pdf
    • https://namratalakhotia.com/userfiles/files/zukeju.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/defufapipulopiremaxijo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145649ef0a03---demidexujazumojusudodi.pdf
    • http://dastone.ru/userfiles/file/basebanap.pdf
    • https://greenfins-thailand.org/uploads/file/36559141601.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91d091a2c---kezebinaxowezunoso.pdf
    • http://majortaylorride.info/images/uploaded/file/21757150355.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/vajesizasisedesudojexaje.pdf
    • http://domainecomps.com/documents/files/38242238409.pdf
    • https://champion-osk.pl/userfiles/file/93043057054.pdf
    • http://anthonyvienna.com/sites/default/files/file/xotodufaxi.pdf
    • http://hmed.vn/upload/files/wavolumozuzefapel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=security+officer+cv+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin
8cd570e43cac175920ad7890b7d1109a4f3c0f0c0266b19e00e741da88bb3cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10488 bytes
font_01_sfnt_off0000f4f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes
font_02_sfnt_off00010d0a.bin
bf46244bd425704f54e8d665dfb50a98801e413ab01de8c1a6fd154e7cb4c134
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 18024 bytes