Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37f206baec53ad4…

MALICIOUS

PDF

88.8 KB Created: 2021-08-15 05:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e2cfa8adccd83055ebaa59eb8c19fb5 SHA-1: 878e9140d729dba8120d0954d0db1587630c8989 SHA-256: a37f206baec53ad4c9cb7da80c9dce3c369837c89426391642be8780bf1b653e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of these links suggests the document is used to direct users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://meesens.be/KrMee/Tekstverwerker/62615991855.pdf In PDF document text
    • https://mudraconsultancy.com/uploads/files/91775296676.pdfIn PDF document text
    • http://jucal.es/images/file/ritot.pdfIn PDF document text
    • https://unosms.us/userfiles/file/sejepeguriwujera.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/fufokobifenukarurifixisax.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/43423118419.pdfIn PDF document text
    • https://coluer.ir/documents/file/xijimokodufegusebikab.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7e6f1f79a76e24b83a1401ee9adfe57/refodekesukowosave.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/23815051883.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e82812af0bdfe9cb8b01b2f17c9a761d/73689038024.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/36149164597.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/mebejegip.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4c7ea930f517d7280266c1eafeea416e/lovudunol.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/baf7c99f722a210f30635cdd7efda1d5/45419514591.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021080413530273499.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/59hj5l948sbmhakifbtdvtkfeu/woweboxedipemawika.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/03407ad1cb58dd3411e30d23baba6e35/95919554255.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6920ad0353b0ed506351b68fe9fa2b71/39859082404.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/87632761599.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ded3a1b206ad5221c0bdf720e8975645/dizanasorozudozuvo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7c5e0c2a---xenedovixu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41722593744.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/mesidabemaxavumuw.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/83718633648.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/paselodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=longman+dictionary+of+contemporary+english+for+mobile+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 11364 bytes
SHA-256: a19846ff85f27c804de55f38eb022731c68a4c41ef7970f4c310b41116b1a902
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 17360 bytes
SHA-256: 1a24f1eddaff7c4ca64bb17739b817924c2d7ef9e28ca043f841b6542a844df6
font_03_sfnt_off00013c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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