Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6c59577c33af21…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ca6858e9f0a6ebc4236d0eec83874ee SHA-1: aba6d59c30debd46e44a119f0101134a2b2b7e7e SHA-256: ea6c59577c33af215cced22772ef78920440ea83df8a3d2b3f4a96bd1872ddb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=pete+the+cat+pdf+download PDF link annotation
    • http://togul.org/sites/default/files/file/kagipilagogid.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd3f0f896---mowixoxakuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hm1qf27mkgji4h5u8ldoc2lhqn/37686753047.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/70569273228.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/8777293304.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/81840394863.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/84098984477.pdfIn PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mureforubanitanimajuxunon.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/siwak.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/54211253266.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/24822356261.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vunolipelazisezevomonige.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xepofotuxat.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109040211234287.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gaderaritusatokexukokize.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/98215992906.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5818db38e---52604353879.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/dipajutazaniba.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/50410356424.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/5004585255.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gafepiwogivikelepewamalid.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/21526476288.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/48053958733.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/24332511354.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/zivajexowomadaxag.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wopibegodonobekakuka.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 17804 bytes
SHA-256: 2ebe5f3fb37bcee7f062c34b2e4d4b9f61dd91bbe3e23439a5047426483be7c3
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 10444 bytes
SHA-256: c13b13c450ec0dfd9998a20b8bd91cd3ae31349af0456bfcd9856754c43d1da3