Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98bfd67afd2292…

MALICIOUS

PDF

83.6 KB Created: 2021-10-13 02:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 06ec00931e932aee4a4320de227ccb09 SHA-1: ea7fe4fddb39d625d1fba16de75f714f228af6b1 SHA-256: 8a98bfd67afd2292599f9d6dc595d2ef43f86be41d18bbc3ab694ed84beaaaf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=ms+dhoni+full+hd+movie+download+1080p PDF link annotation
    • http://icltindia.in/userfiles/file/40958726340.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/22499235241.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f38d6ac88---luweginunalepoxe.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/ximegeduvi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/30144982773.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/xaraxuzozekebaxamekalisuk.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9efd9fd7b8eb578dc91735032fba0776/xudejo.pdfIn PDF document text
    • http://didopack.com/files/29817718527.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a0728b97509d880cecb5d399fe595fff/59030346631.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/rotarabupij.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/31821391799.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/25020247800.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/lerelup.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202110111531264124.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/86522135304.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/xofusijisusefufuwan.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/82361339528.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/d77620e2pcchs2k9sha6pdk5qp/xufubegugagos.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20211002/file/7522712594.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/59655898973.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/28530331437.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/60821550049.pdfIn PDF document text
    • https://bep.semmelweis.hu/userfiles/file/ginunufupalenegikuregel.pdfIn PDF document text
    • 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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 21032 bytes
SHA-256: ec48f81a7df6c6bf6af2f310626f7cd59b2865726f06d819d827e242436808b1
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 11192 bytes
SHA-256: 047974565301ba29a73d213a860f96fbed0969e9300e8c6ae737caadab2de87e
font_02_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1