Malicious PDF — malware analysis report

Static analysis result for SHA-256 152fa92b29eecb8d…

MALICIOUS

PDF

138.8 KB Created: 2021-06-27 04:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bdfd9e44fe7c96db4ccc11a110f4ae3 SHA-1: d2a26ae568c783d2f62f08dcc0a2f08c4f791e9c SHA-256: 152fa92b29eecb8dfac29e7d02286df36ff49169011211309167d9969c0caf37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mackyz7automotive.com/js/upload/files/bovoretevuwalu.pdf In PDF document text
    • http://quickvideo.nl/userfiles/file/diburepajezeti.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780e8dbcc4c---memipudedamer.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/587c968a562340f2a00405c7e7dd0120/xidifileduzafejupazekon.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609460bca38ee---nenetodi.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/48800175057.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1fa26747---12840119562.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0aac72444---10144513715.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16093862e83584---52085137820.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1d1196d6---26599378930.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/sesazagam.pdfIn PDF document text
    • http://stattus.com/assets/file/nazawemisuj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd710405bc9---debir.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/88188743314.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/783e746e2bda4d93eadc78e9306bd89f/60886369283.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b102c75cb---pedabefubis.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/64159769900.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lizuxipom.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/13vdinmfnmv0in2nu7q5or1ic3/15256670628.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/femukigawogumuka.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/1747505374.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4a29e1b5e62ac2bb7718643c0f42152b/xefilesosujesotexogejibax.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/60546559884.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/59677404217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=joining+arabic+letters+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00019cb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19CB9 82852 bytes
SHA-256: 5e51b1603e9a632cdda37567f3ecff7e2c05218eb209cfc238e266cb2cd106f8
font_00_sfnt_off0001567d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567D 17408 bytes
SHA-256: a28e85099f39deebff6d1e1d29bcfe69dac00c33866020a92c284d49a6dde4f1
font_01_sfnt_off000183ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AB 10928 bytes
SHA-256: a2656d398f75adc98f4c0b0ca12bc050e0c7e63e7cb54ad2d5b7567801e4d808
font_03_sfnt_off000203e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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