Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb87f885d5bb76a…

MALICIOUS

PDF

99.8 KB Created: 2021-08-31 02:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40fc23e9bc070c57171ea13aaad5a62e SHA-1: 7da7e57b327f30dc9b34092d4223c0663f52eb0b SHA-256: 9bb87f885d5bb76aaea4c6dbc0455796265b903f95925bf9e2498a120f78a6eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.rotudavid.com/ckfinder/userfiles/files/50027514927.pdf In PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/15441756384.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c259b9bbe0039ef8459357589a8cede4/xijedepog.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/zamugofaromuvewuf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609093f392e7d---kesabagitu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607666078dc78---tobimibetabimuz.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/14368467530.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/87459b70e93345047a5b3bfda84722e1/bemadaba.pdfIn PDF document text
    • https://hiroyoung.com/data/files/68013549270.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/jigezixupediwiregugunedis.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/53036723390.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab7605df4---wuluxelegifageroxa.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/37850607150.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/sivepuvekeninubabubukusu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1b666470f---xurofinojabopagetep.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cef6786cdd29d7612bac206e756e173f/jimexekubagoxenade.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fdb59c06238d222320c6b930c06b20c7/85642692580.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/denedazaru.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/78985653160.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/06a6d10eda950abbbcd5ae747268d007/58926048925.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/7937308341.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/linolifewam.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/70746154730.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/72cde9ed8dafb9c188ef474859511911/jefiwejanemujujagaleladu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/muwuvepezozapux.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qee1enca1dj8e3jd244gmncj23/51274123279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=homeostasis+and+blood+pressurePDF 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_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 10784 bytes
SHA-256: 0a190939f5add01788f73596f3de3eeceb884578d1495f0efb434ab468783b56
font_02_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 17156 bytes
SHA-256: e10c85485acd3af47aacbbe79a6eef665b7546cea4127ded77e6c2417c744601

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