Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ed55ee5a6cd67e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 18:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edd3ef7a0446ef50934badcca02aab47 SHA-1: 424e2504fdc8519bcd4d253d9c479a5057010078 SHA-256: d1ed55ee5a6cd67e5a6196d86568f40a48ae93e6ed9f57202f7d9118ef8f7f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious purpose rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1nhct8pj80e1t5pqd06ibiha6l/49129651060.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hja0uq7gjijl5sb09823g4mi9m/xusulomulusaja.pdfIn PDF document text
    • http://drhkltd.com/upload/gezavodu.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/pojubulawuwosigowone.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045809cfdd7---54974200278.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/revifosabisazulus.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/20474074964.pdfIn PDF document text
    • https://unosms.us/userfiles/file/97163546245.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083459e4c4de---69049707139.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3928995270---wibivij.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0p7dc7sdf2hubkm2qmci4eo3lf/16192563350.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f24e5b4d74bca484c1ea175736b3c75d/2352445842.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/2439749178.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/fuzemepivenutuxopa.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/8467211072.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1ikubhbkbam8g797lsq2m9uho4/65058721342.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/891be1884fb54c0a65538e8695d91cdd/mifonovuvigiwetusolo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c06af1d64---totimefupesebilokatug.pdfIn PDF document text
    • http://minerva-collection.net/files/files/38630981165.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/90576836344.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3a2a2c83---xizeziwugosidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=presentacion+posicion+y+situacion+fetal+pdfPDF 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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 18868 bytes
SHA-256: 044a1b27234e664ca2af1760a035298eb827b550d2ad521e06cf144a3b5e0cff
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 10828 bytes
SHA-256: 262b8f9f800f779ecf5afbd2b59a924b097023a908e2abe1653c059753eb7386
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1