Malicious PDF — malware analysis report

Static analysis result for SHA-256 b557e03afd9882ed…

MALICIOUS

PDF

94.8 KB Created: 2021-07-17 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0110598749c3070df1b87f80af32a80f SHA-1: 1913b9ad8892769390c3827f6e4f49788b925354 SHA-256: b557e03afd9882edb238cf9eced3811695638f853337d03b1c3d0813803c8f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous URLs, some hosted on compromised WordPress sites and disposable domains, suggesting an attempt to obscure the ultimate destination and evade detection. The primary goal appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/pafofoda.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370623e68d---99771906419.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb7665979---jobomibebedewowefasegaruk.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/gevekeje.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/37862385843.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/fe599e3fb2bdb4c6b4131bef0b69ae33/5212129559.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/94034035631.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748046e174d---61101569673.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd3c2b8c28---39586159913.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079468a1723c---dudiwivemedaxinaro.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda307c560---nuxuvelow.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8f373419---31317212054.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797bd7b2cd---46088552854.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/mukulup.pdfIn PDF document text
    • https://loctra.net/userfiles/file/92239777373.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/56187707441.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210621_203700.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160983e1ebc2bc---xukimikutogabolomajop.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0cedab393f910570b9704531c4259c25/noroguwimupasajukekuvug.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/45108188668.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0fb613a4---piwolisobize.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bkoup6dsdc2jd410v356nd1v96/69258238316.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210701_205DE823B7118D4C.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/nijegazubelu.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/041cb8a80a6adc380932131c9de6b9fa/timomulokudakow.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/57876614220.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/nokifuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=figurative+meaning+of+a+wordPDF 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_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 17200 bytes
SHA-256: 4f5a2e37f2f6c12759df1166109a20ca6c402f98eb01b6e14e9dd00068238b5f
font_02_sfnt_off0001552f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552F 10712 bytes
SHA-256: a238424b96dea17012f71a96c6094b1b596a3a73295f1d217fe232df27c39e45

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