Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded0d1c3f30b0ff0…

MALICIOUS

PDF

110.0 KB Created: 2021-06-11 01:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d765ab525e734f3e892a44a7d91fee86 SHA-1: 19b5b74bb94400aa8019fc18541f277b527ecd3d SHA-256: ded0d1c3f30b0ff05a939d10cb366f55974eb3617fc73d4312bd645c3c997137
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 0.9997

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://medvor.ru/uplcv?utm_term=sonic+mania+roms PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a43bd14f433eaac9b884f12580f9876b/gadexixa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086707c76015---77449513333.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29963773962.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53c137c02b8b26489899a6f985ac6d47/vosuso.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28a7a2173---wamot.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/39006824031.pdfIn PDF document text
    • http://rld-carbon.ru/file/4380960005.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xalotuwiniwotagivi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3kdupbkrd45pue7c2ndoeghdua/donefovevigobibojozisozir.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/13136904913.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b2be292b1647ff7a4e1d8b7de1835adb/32658307924.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45a2a764ba---25199162008.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8d51b265---xipop.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/2ktagla8551h4j7s3nftskampm/gifunib.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5tbv6vbl07gra996oab73oc4rd/68982252977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 15736 bytes
SHA-256: f1185460068884d83cec9e3e2d378bf5ce650b35d2d75d6ab93230a5e2c7315d
font_01_sfnt_off00017394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17394 5016 bytes
SHA-256: eb5ab14fb866d2e73a4f53f92f8b05c0703df027e9e54073c04242149c87f66a
font_02_sfnt_off00018484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18484 11412 bytes
SHA-256: 5e9b927936a63f1f9efa9f7c07ebe05d80b794b394c449e6727fbb2543d9b4a9