Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3212f22f631e9db…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 15:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59deba615e451e8acc2c690d20bc5181 SHA-1: 4d524eeb0ebe6ed8670e07a42476ffbd2e835def SHA-256: a3212f22f631e9db2b6a857b3b5e50600f8cdf9959750671cd6481ebd1ac17db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to external resources, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kleinimmobiliere.lu/userfiles/files/zabamo.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099750f147f3---bipipaxasuruxozu.pdfIn PDF document text
    • http://digifast.cz/userfiles/laxonuporifetazibumirujo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/490013081242e7a31fbd1525642f4f50/40337310193.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xigofikelifovipumowipari.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/38653695700.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/38454975865.pdfIn PDF document text
    • http://pvvc.cz/files/gafozefovarizonaro.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/70844790825.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5hf8h660i4ocbbpt967smur2u0/27429111546.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/48290643441.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6348d57a812342d1370158f584ffc023/tagawaferitefavabugi.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/23077895319.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf18534ae3---bobiguj.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae572de364bd42cedfacb20699fa6fe4/pomolonavagipat.pdfIn PDF document text
    • http://ridendo.cz/files/file/womenigefebizod.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/42555991979.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/jirilerepokurinawukijog.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/nodanodevoduwazesonelixu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105190023182490.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f5a0d14f855f2dd0f6bd475189236034/54574092577.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/sologeneg.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978e78368b3---18698490884.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/62788362805.pdfIn PDF document text
    • http://humanlitech.com/files/files/70397062458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=prokaryotic+and+eukaryotic+cells+worksheet+answers+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 17032 bytes
SHA-256: 5153276f0c34331e212223c2cff396a99e25cdde6c774ceda266daf6b0b89d7c
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 11108 bytes
SHA-256: 8991f44ed31dea43aff79ecbedf285a9c8f302a8bd4b72e7be5d41e8f1e7c226

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