Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1cb8a5acf74915…

MALICIOUS

PDF

86.7 KB Created: 2021-10-13 18:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: daee0c0057e8731db01533c6158d2843 SHA-1: 93bf967bd24d3c8b1b20e0c9a5c86a25e8da4075 SHA-256: be1cb8a5acf74915f5b6f368301a48ffd5a57ab4b18164133aee95f8eda66afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple URLs, several of which are hosted on compromised CMS platforms, suggesting an effort to obscure the true malicious destination. No scripts were extracted, but the presence of numerous external links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alistairmills.com/ckfinder/userfiles/files/78141386793.pdf In PDF document text
    • http://anninh247.info/upload/files/60762839648.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5cde8fac---kujopojotunojoxobapaw.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/wotobepir.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/nubaporumujekokolelelunij.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4v2kdao812oj8e3qqjt8mca1jb/50117982206.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/dugebunejobixetokobudo.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/domojujigikemifinat.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147595219dfc---zuzaxizuxagekibati.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/gedanopadawifenemolew.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/12726043156.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/69591620881.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/34142896444.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/81986823304.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/fapifuwamigupit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490b2f9b249---gigifivepiziroseb.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zefudaxoxema.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zasasaxotitudix.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/80078877762.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/bozujidateralaxesug.pdfIn PDF document text
    • http://lejuriste.ru/files/file/4645002944.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c87f4d549d---saxosivewulawetesumope.pdfIn PDF document text
    • http://nepaltravelsandtrekking.com/userfiles/file/15746583205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=active+stretching+routinePDF 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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10448 bytes
SHA-256: 2a6dd39b6b025e658d09f8116042626996c91c0ba787a98a6bb60cb41646e8fa
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 18272 bytes
SHA-256: 86386fe4e1e4e56e8e38cdf8f063e4b0c89ecd5e25680620c10fe3e8c8bbd4e8