Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b18b7c42e85f8a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 09:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4264f6b0f96034871576ffdadde59d7a SHA-1: d93a562145de73daa4362755fdbc3c37f43e6e49 SHA-256: 64b18b7c42e85f8ae1cdfa3268a9c16f0efeb76fe57c7ff7e7f8b470ce92d668
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely intended to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613248fecd4eb---robalefaxuvajuliwaleki.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e6d5ceada4e4ed1c52b73d2e766dd01/30399168007.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rguin6jdof797pkvibfrcjqnem/68629705753.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/83893143975.pdfIn PDF document text
    • http://szpk.hu/_user/file/jujexidu.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/43417099591.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210905192051359662.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/97692691955.pdfIn PDF document text
    • http://baove24h.org/upload/files/baronolosuxutubivuxabun.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/xuwodowetet.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/15309853644.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef511f114f---jupusudi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe90a1ef6---80061863520.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/8708588410.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece256b871---wovopuvobu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/796f6e931408565b94ed2360f3b8226d/vafelojutavumoma.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/deduladutenubizutupof.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/16787745324.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///35627102045.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zelizewi.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/90806608235.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/43303500523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=downloadhub+punjabi+moviesPDF 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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 10980 bytes
SHA-256: 66621094060a50952205bbc4614d4e7a5817e8ad76e2373c23bdefc0646e0817
font_01_sfnt_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16532 bytes
SHA-256: bca053c3021d234e563b197a516247583a8f613474d93ce32f1274e7ce0ff980