Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1bcea31aa49f5…

MALICIOUS

PDF

83.5 KB Created: 2021-08-23 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5958686474fe8680991a12fc0e58785f SHA-1: 8761709329307ee0da7115596be6d4bf877ef22e SHA-256: f2d1bcea31aa49f50c792ed5964f73ac1e0e5a00818c0669978a5514123a8827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shengnabei.com/uploadfile/file///2021060601581120.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c5c5839703575cf9b88065f6b708681a/sexolusirivuped.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16119157409286---tigikarogetaxad.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/nisozaxugifiwisuken.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/76669179587.pdfIn PDF document text
    • http://mopron.ru/upload/files/xasowa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e619a008f4---runifevoxadit.pdfIn PDF document text
    • http://guowangcable.com/d/files/bomegixo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd679940dd546fce2e99c733df2e9b95/98739533071.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//farudorajep.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/bizipene.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/gutimu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc0b508c9---50515796056.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/fafuzoriko.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/65061969483.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed124021ef---jedexesomilitikalesi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/gokatuxezup.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9p90quvjgnor5eqaqn4vhh83k/46764293657.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/af923c2efe7ada81487a8c2fbb57304a/dezokesirupobug.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210808042356837.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/gukazubevekitivoborofufam.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/44142965922.pdfIn PDF document text
    • http://iucecb.com/files/file/52956912758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gk+questions+for+3rd+standardPDF 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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 17316 bytes
SHA-256: ba35264f725ec45830f9cf703494f824cbb11c8f0e50dadcbf6232bcdd782a38
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 10848 bytes
SHA-256: 6e48a999cbd67291c2cc7527874c02e5eaccaee4ef779246b3950676ddcb48a8
font_02_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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