Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fce9ba36dd93a45…

MALICIOUS

PDF

89.0 KB Created: 2021-07-31 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d827cec35c4a5e7a3cc124d1296417b7 SHA-1: d20a4dd6b980a0d6d86c7f356260c45e35e46ef9 SHA-256: 4fce9ba36dd93a459f88b0d554773f2a637cabbf4a9aa9ad459053a0480ec878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised websites and a visual download button, suggesting a phishing or malware distribution lure. The presence of multiple PDF link farm heuristics further supports the classification as a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://di-tech.kr/fckeditor/userfiles/file/gavoxixijejisulumudil.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/88a0769192a8d85967af83c01ce0157d/22472562473.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/rajumavozuromi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/36254917224.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ee13da4b1bca9bead5ccc5eda480de17/fepubigij.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/88719332025.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/viralanun.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e36314b2---44000919779.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160903f10c1ee7---wezezegowixi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7vk5ag258bcotj2qpou0nu8rj7/siloku.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8eb6f9b---28771901784.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/semurijunujalifep.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/jafutopijo.pdfIn PDF document text
    • https://hgb.se/filer/file/noxafowalel.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/47268351572.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xatusexu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd01447e5d---95373269951.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0404119d91---lumivajolefosamiwepaguji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e642fe30b131d2c95d122662741ff085/95338246238.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sgvt7q93f9a60nmgi2mn4hgt46/kakazuloteguxasoveruj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ec9d7e6c68b1917f604deb343bcb5f59/38341717761.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/38513443712.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/47171370538.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmqrgjnk6ceo96u4b33o4de0c4/pikobunokogemi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2cf76243741b0537f652d9fd1742b653/51885819205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pirates+of+the+caribbean+1+telugu+dubbed+movie+download+tamilrockersPDF 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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17904 bytes
SHA-256: 472d64da865e59e79b257b12c2209dfeebdf22a318bc630f60bcc7582d8ef8ba
font_01_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC2 11460 bytes
SHA-256: 7cd75b8a05993e9f4e754d1aa5fea845429ec286776bce2c564dca12520d82be