Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74b2cc5804cb6d8…

MALICIOUS

PDF

112.7 KB Created: 2021-06-20 23:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 863255679f203241cd8e777ad93db822 SHA-1: 48bc86034f4a2f85a9a4ec3dc4509431cde716a9 SHA-256: a74b2cc5804cb6d87937deba69352af0ef6d9c32b92d1c7a82df7fa30a3252eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae057da0f23---84108085523.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ae9507b43735de8a5d97fd4512a4c2f9/82276742830.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95727598532.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85150408104.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad39a4d029d---84799004077.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8200137a---didex.pdfIn PDF document text
    • http://446888.top/userfiles/file/26544413776.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zujiv.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f032ed2676ef5701f0bf4611c6ff8d35/85486942513.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/mijagivinoj.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u2i84brn8s0d1ic9cqt51uivv4/lapejesom.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dakibokazubabavenadofumop.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/69541850456.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976e8d8176c---xijil.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c595b4d7d---94947594302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=caracteristicas+psicologicas+del+adulto+jovenPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d49e773c5d88162ef00dee00eb2124c7/19766390467.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://scripts.sil.org/OFLIn 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_off0001685c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685C 5280 bytes
SHA-256: 99f3289b4ae5d841dedda6811debdbabf8a5c6cee5ddd7728020ea0aae5b4905
font_01_sfnt_off00017a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A65 10208 bytes
SHA-256: 63e4efce9abc0f8df868bdb8cd5f18b8c04f19d8d65fde3a2e39c50b89dae2d9
font_02_sfnt_off00019d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D83 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf