Malicious PDF — malware analysis report

Static analysis result for SHA-256 577fac7dbab2cd30…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 21:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e6c0f7e8cf08936508b4261c8a58f59 SHA-1: f20967fd83dce47431a3749e58772e847b19d989 SHA-256: 577fac7dbab2cd308975a8190d86d482d4b26b5359845968a305e899bbad3d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://fujieshubao.com/zk/UploadFile/file/2021090722204673499.pdf In PDF document text
    • https://bunian-co.com/other_files/File/gewatelejun.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/95930133723.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/90292042714.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dubefisaduso.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/96216813710.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161433c86ccb30---72556272507.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf25b8ba0---tebebofuwemewajemixiwe.pdfIn PDF document text
    • http://tid.vn/upload/files/ripuvamirixunelamudevax.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/safisobefukuk.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/pasivigo.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9e671ada---27057349681.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/rofosizilinewaponor.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170747d4f9---jeboduza.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/misafigogo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/81adfce9e1f68d8232bb83adedcc0249/foxikapijulijojowati.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8d47f5c88a82485fa66c4d7f2662a536/33531216092.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/mewakobazotok.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161465544e72fc---matipojuzilunisobapopuv.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/30485796611.pdfIn PDF document text
    • https://path.mn/userfiles/files/lumagafixufokurujuwe.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/29846045660.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fasilizuzawijepirug.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/jemozaduw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137695011ad5---gotuwuwewimovaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+russian+gymnast+dietPDF 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_off0000b795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB795 10708 bytes
SHA-256: b3f11bc55cbc003015fe8caa43bc4fbc664c7cbf12c29342b72e84c3925b9edc
font_01_sfnt_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 18516 bytes
SHA-256: 2c72567046d10d4bc6257e8d8e41bfeaa02b1160b584e883ad01c2b0a805e883
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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