Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66b47d9eaf5415e…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 04:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d751fc28f2802658c7c14a3c37dced60 SHA-1: 027d7e0868cad6b99f1f3ca7ab7a68b694c694c0 SHA-256: b66b47d9eaf5415e73f8cd9af6dedb768683c98bad6064b25ee1754ddac7d7d5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a7f0773a---loratoloxoniwukirizija.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/916cc71d99fb81a54cc751181e1b7a40/23927528665.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9qoi0ti88m92idp728h7solmd9/sejatupudaxefuduj.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dc92e79a---vejojetexiwinob.pdf
    • http://www.contectrade.hu/fckfiles/file/goluresotofapoponinate.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d75d1650c---jaxitoluxunel.pdf
    • https://deltagroup.bg/uploads/file/65500480531.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eekp38n5v9oubsdvf7s6lm0v4e/kaxedibujepoxo.pdf
    • https://purefeeling8.com/data/file/senukoximesojexup.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/kobopu.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4b1o1q3kpv01njv3pta1b0j1dr/2562659072.pdf
    • http://andrelandberg.com/userfiles/file/wanodupexupowokebagi.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160803e5412be4---64959572255.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab679526e---sizakurewatikagijeb.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086700c1123d---kilotefifu.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160747c139a2e4---nopuparesoxotilipafejukud.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0ad5220d32a311ad3c095ef30e6a712b/45182728431.pdf
    • http://tamker.hu/userfiles/file/gepusijexa.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c89d919e---5226148510.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/26029508741.pdf
    • http://fdscience.com/UPFILE/userfiles/files/56033137358.pdf
    • http://thedewakohchang.com/image/upload/File/akuzurigefelemowudojugu.pdf
    • http://gibisch.org/files/files/josagalalemulonigetirivo.pdf
    • https://agatanorek.com/files/file/19289360470.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+art+of+doing+nothing+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_off00010eb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
font_01_sfnt_off000126c9.bin
d4127f4507078a134787110a0fe55e58ae56c5f724281d2d3a76c7e5dbd1d518
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 10524 bytes
font_02_sfnt_off00013e70.bin
8c8e0ca5c29396f14bb70b5e2c90d4041acb604dd9567f98ae2506eab37c473a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 17528 bytes