Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a58353555594d37…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 17:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37139d69ca123a794a6caf90adf0aebc SHA-1: 9597d557e64aca54cb750fe0c46b712213db1d81 SHA-256: 0a58353555594d37c420717dec06ca72982e6842207bdcf7f0c5818932351eca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://domplus.su/userfiles/files/92887407868.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50b357643---zixadi.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/joledawolumizozanupaf.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kawexopifewenafaxudi.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/71926293068.pdfIn PDF document text
    • http://dongphat.net/upload/files/62670387460.pdfIn PDF document text
    • http://zl369.net/userfiles/file/gakajetitidekimubiv.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/66568384469.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/70595651360.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/biwuburupof.pdfIn PDF document text
    • http://cutskytools.com/d/files/zitapikepavorip.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377e907bc17---96338466836.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ee5c7e2---68501898876.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/fepisowe.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/lukiriwi.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/13663204517.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///52591646577.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/likuregekusasatawew.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/kepesit.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/14157588057.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/pokino.pdfIn PDF document text
    • http://maidichike.com/upload/files/43219770899.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/toravebifafojiwurewinanaz.pdfIn PDF document text
    • https://olterus.com/contents/files/55352683718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nitro+nation+storiesPDF 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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 19924 bytes
SHA-256: 5b3e3248cb79c7b68e876968d79eb122d3424f949b3ed73a9130d6705037446e
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10032 bytes
SHA-256: c7cf72dcbdc77ccdff44287594badc0662949ac1016078153b69f6649d8eab01
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1