Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacc1082a09fce54…

MALICIOUS

PDF

87.0 KB Created: 2021-08-07 17:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de1ee8368d2e19cf4157dabed3b57da2 SHA-1: f63a64d41959094549b27057605bad96798bb836 SHA-256: dacc1082a09fce5429f27bd3839f7454407838dbdf8a8923a3dca8c5a9fa715d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=el+cuerpo+grita+lo+que+la+boca+calla+frases PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4646c0888---koxuk.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/raketefiwinogovemudevogag.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621589225.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/76600351615.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/604ceb5d6cab0bffb4ed307483470c3d/19762991587.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740910dc4df---71135945668.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/052af6c056480cf8151329c4654c72cb/dowozokizorugufajuw.pdfIn PDF document text
    • https://steammining.com/userfiles/file/weronokisulitejosumi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sojibukagunatixo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/72297566490.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c58a3d59edca041f92e72fa4abe52922/50241653.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0349531962---baxizemugu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceabo3uu23d2aqs09lk18gq4jq/69471246984.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1634643c36---pimezave.pdfIn PDF document text
    • http://sunfitclub.ru/app/webroot/js/ckfinder/userfiles/files/sobagufugubikalif.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609580d5c7285---96466231780.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/vubekagewufovalugefob.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/71264923073.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/leleji.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/16180054673.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/dosivuwepinalozur.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/82dc4dbbe051d1eaecf17f8fd5e9c163/15688777045.pdfIn PDF document text
    • https://flyags.com/editorResources/file///22356321032.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00c4b8e73---mefifenivonerewiniwawi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/66b487872bae36d3f8dc27c49c884424/12343471390.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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10920 bytes
SHA-256: 170ba86b013273d079ff30f4b0277f34a19324071ea3af7c2124144c5fc2ce43
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 18176 bytes
SHA-256: 6be0e45ef451dd5866ad1ab96275a15065389cc5c3023892962dd07b04ec3b7f
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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