Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcdf52baf9b37b4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 07:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa7cf7b2a3c35f5c4c2203126e468c3b SHA-1: da732b919c637988a52f805f731cdfa7d8879aaf SHA-256: 1bcdf52baf9b37b4df777e836d37a8de0e7d3f6950ba9b246215fadd7ad6ce4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3bd6f7eaf5ed44853438bca4a45a97e8/30428229981.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1efb089cf2333c11189539ec7937ed54/bazazoginapuvifevineg.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/90058032446.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/22087513616.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf91c1fbcf---82564269062.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gewiwon.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/95677302568.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/tiseneb.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/gareva.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vc28e7mmuk9257u0m5ckpp8rpk/59470890959.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/julekifinug.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5360a489---sivixofopoxiwaliwe.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zazuronijej.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f2db0b932c0609fc01db11303040b177/xusovi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afba74cd56c---57457234944.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/16439989847.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/25402503518.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/putiwogujoxipixunakutavi.pdfIn PDF document text
    • http://ccshecea.org/upload/files/76412523012.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210615095757059909gstrvy.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=qual+o+livro+brasileiro+mais+vendido+no+mundoPDF 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 19708 bytes
SHA-256: 55896b619115f0eab49f12945715bceb08c64923443a2e624b7367479aa0d000
font_01_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 10676 bytes
SHA-256: f95d7d5084ae1f6b0d405ebe20bb06009c10cac82454b09984b2eceae2a43c96