Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8c24bbe2c310d5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab27deeb02bac849756ed19369bd0411 SHA-1: b2d9119a8719ddc5c7920aa2f8730ea0759498dc SHA-256: 9a8c24bbe2c310d53b6b87b8f6fa623b48090ae3a36c5e9ad8a25706c2be3a78
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to other PDF documents hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially inflate search engine rankings or distribute malicious content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://manisafar.com/basefile/marcosafarir/files/winabujanirijevaka.pdf In PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/munaguzifuwosovek.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/20262284921.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/47278859700.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gisujax.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109041603225342.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/faporogep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a2ef6b2cfc2659977acac80ae048e0ef/83989841770.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210901233552_967840933.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0fa1adfe6---sawodomafut.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e3ee4ad---niwapajoriri.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/49110307918.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/36413441297.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gimetaxopox.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/rufefevejowarujo.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/nowemizaxadewunojubikopu.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/19617423725.pdfIn PDF document text
    • https://susta.vn/userfiles/file/meripisabapivopubigepirux.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/92914050498.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/pinefojajuvaruniwigaga.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jivizinatujubol.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/5017263810.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/famavukusoxakusariz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spaceflight+simulator+mod+apk+pcPDF 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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 11232 bytes
SHA-256: 24cfcc3409916b7f7190cbcc567af85f7c8bb1792e2700050c37842cbce61aba
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 18616 bytes
SHA-256: f73384f06baee96de25c2932aea0b24e3ef3f321a60bfb95a5e0a35940f506ac
font_02_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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