Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e402f1bbcdb2f67…

MALICIOUS

PDF

80.5 KB Created: 2021-10-17 23:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c91c13138ade670b8a0aa40c536f22a2 SHA-1: e745b97a6dc454db19672c16ee50d3358a3ebea1 SHA-256: 9e402f1bbcdb2f67daad0fc07fc497367f57851a3da1cf560e8b9f71640ee91f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of a 'download button' heuristic suggests a lure to download further malicious content. The overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161513fa1ea707---lagebidijadufam.pdf In PDF document text
    • http://www.thaiboat.net/image/upload/File/nusile.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/kitukilutorubujurazujus.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/gogeselaganusivumamatir.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/26216386655.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155c5975c17e---tegilowivuvupejaz.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/83095210953.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/mosikig.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/jilazowimav.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/44475113234.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/vulegemama.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/42792497749.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/66909774431.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/16491381514.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i6ad0vbv3phtdhomj8rji0p6g0/runoxuselugalizovidibu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/42509638850.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/24629858490.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d66671f92107015abcd14714e0f2e7a5/teluxajibi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/lovozomi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c8846e99---98600095597.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140485c7e3b7---59854539935.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/tugebibapetopajeme.pdfIn PDF document text
    • http://kystar.net/filespath/files/20211002224856.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=red+riding+hood+full+movie+onlinePDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 17448 bytes
SHA-256: cc7232d407a1a89addeb2851a2054195d15a616037e02c1e7d6119319232abe3
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10584 bytes
SHA-256: 34adf066054fab2740cefa291f577ec545e4bfba45dc582a906287edd9e68887
font_02_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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