Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c4cb9f5d9cfbe0…

MALICIOUS

PDF

72.7 KB Created: 2021-09-30 16:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 247a3127409d50975cd9570bf67dbc60 SHA-1: 820567435877b87a2464cf341102ea03bd57996e SHA-256: c8c4cb9f5d9cfbe08d29c372e370a7bb2dd259719b45e306b8aa3eb504ab47e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://emotionalgift.com/ckfinder/userfiles/files/7913062365.pdf In PDF document text
    • http://hugslock.com/app/webroot/img/files/zazukibejixifilu.pdfIn PDF document text
    • https://service-panev.com/userfiles/91771830532.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/72891986850.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/11988326834.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/xomajugorularijeluvafij.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/296657882.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/44291172919.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614381151ca3a---dapuvemilis.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/peponuzafuseri.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459bdb0ef53---17107290823.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/70792497428.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/16916266629.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/90480507466.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d1161a37e6e6fbb921472fe8f81c8392/lozekevuxofidezixumixog.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/42375003017.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210915230955.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/73968378090.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155bb09a85f8---89935202574.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613921fa0f53c---96373921131.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/42932203731.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614206d5b7183---6741805518.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/20129343669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+hide+messages+on+android+lock+screenPDF 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_off0000b76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 17220 bytes
SHA-256: 3dbf6de8c64115031b7d13a8e4af4ae8bf7ace680c42f34af86fecd49838708b
font_01_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10984 bytes
SHA-256: f4c84921007f80f3d9f63d64c7a8bff07cc88f5ec258295f57fd12ba04c58887
font_02_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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