Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c52d68c02f53338…

MALICIOUS

PDF

99.8 KB Created: 2021-07-14 06:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fca1fda6bced32b3aff40d88e69c9e0 SHA-1: b85032b4651ece9ba074f4e66a0bfcedbea8555f SHA-256: 2c52d68c02f53338ce320f71f377f498925ad5f2d5ce078c10b307c58958d3e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://brandnewgoods.net/userfiles/file/wiriberawusik.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b1df35e06---18050567078.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7675340d96be3b00eac86985660e066f/51215514128.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b721594c16---kamuzopoz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/34049okbhebmfojkhijo5ath3s/9868657265.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56e93f908---93353523790.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wanunedilijofolesat.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/356ce5lsnarmtmeu8urin599s8/85648415249.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-25/20210625095418415720.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b4588d0c---dagunepowubegapede.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/71676625912.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ad39531a---19482783045.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/tusatevel.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/83991415898.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zefavenaj.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/84341258200.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/nusev.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/20732908688.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04bf1f883---wejezejego.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/3ee0fc4426f4d9060b41ff22887aac49/lezapevinuwanokobis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=quotes+from+chapter+1+of+the+great+gatsbyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 10268 bytes
SHA-256: a8600abd515aefe5bb39ce792f2889212a1cfef847a016a61d75854194120e4a
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 11148 bytes
SHA-256: d700180881f8eea3b9eabdef3583776c03f89c4a8929b8ac9302f5467c2d6f1c
font_03_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 18672 bytes
SHA-256: 3d6c4c2957f79322253d28e4056ef5ae950317f5b4ba453150bf227f36e5ab06

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