Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f5ba3f71e4997e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 13:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12fa29d6bd7f2c75c5e4075e1b87aead SHA-1: a0ca5d5c3ea33f487ef1acdc96035fb702d3de84 SHA-256: 57f5ba3f71e4997e5fb7eae60e117f8d37ac42c130c1cbfe855758f280a98253
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous links to compromised websites and a visual download button. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware. While no scripts were directly extracted, the PDF structure and linked URLs point towards a phishing attack aiming to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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 https://wastran.ru/uplcv?utm_term=minecraft+crack+android PDF link annotation
    • http://kingkady.com/uploadfile/files/niwid.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3a2c506e---jexexifesedagif.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/78012158537.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f7965769f2df49c6212b7e50dc67f35d/23888555152.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/nemagiwanibetu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/68fbbde33e7ef698d657f08a968e516e/wijizoxiwobimavikixudavax.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/wipemegedototef.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6e1100eb---werexixezulotawagokuxob.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161403c1da7b59---pominasuzobanedet.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/74107253504.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/komixekekadejolokab.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/78554810598.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/34799220014.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tifolitipe.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/tusavetaroxaz.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/87776755192.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4d14bfa48a670fdeab89cd1d5ca6f85c/xivos.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/12513120734.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/dawarakoroxejodudel.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wesekuzuzi.pdfIn PDF document text
    • http://unsersohn.com/images/file/57502291100.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141936919217---81534898156.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 10340 bytes
SHA-256: 8fc030cf392e9ce049e6a6343ed95720eeeddddc9343b57665015e5f9b7f7e4f
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 18016 bytes
SHA-256: d17d289ccf100e8bbd59044d5d3605d2750ba8ef2f3077dead75d896400376e6

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