Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbaa48dc7d3780f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-24 02:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb07a536925984afa54b1387a1da634a SHA-1: f838ebc96abd22980d57c2b05cac0381d2852f18 SHA-256: 8cbaa48dc7d3780f5d9e9f7f7815500dfb78f19f22d911efa843150d9e809130
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings suggest this PDF is a link farm designed to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=furry+hentai+android+games PDF link annotation
    • http://pincesorvarshop.hu/editor_up/zaposusiti.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/41973902600.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/52336998298.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kotebekili.pdfIn PDF document text
    • http://apismorava.eu/docs/39362072043.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e360b6b2b---45147300538.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/43007582829.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/pixojonemedapebi.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/23386945659.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/98129392678.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sabanavoso.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323b29b5dff---64499912481.pdfIn PDF document text
    • http://gynekolog-zilina.sk/uploads/fck/file/58317985923.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/38362208771.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/98206497619.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161485f7c859ff---wanatewazenijo.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/nijokixitonusadet.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/favodexazobizoxatoza.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16134220e3da53---lonemewedowovoguroxo.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/vipinegaletotovozoluserul.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/kugujatim.pdfIn PDF document text
    • http://na3.it/misc/file/85364097927.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xadizutasukokibofepoduxo.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 18032 bytes
SHA-256: da86444756d293642c028aa4f0144477e3dbd86de1e6c897ca92f90aab78a885
font_01_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10840 bytes
SHA-256: 5ffe2940b6f60b7ee8f16eed18099fad8b47f6b782307a62ab129cad4e1e765b
font_02_sfnt_off000138dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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