Malicious PDF — malware analysis report

Static analysis result for SHA-256 3248333dd053e7d7…

MALICIOUS

PDF

96.2 KB Created: 2021-08-17 12:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5b9affeedf1fab65a58f83f0dc1e9b3 SHA-1: 946c5a52c4488410f3c8dbd4ab33cb687cfa69b8 SHA-256: 3248333dd053e7d765959afde9ce5f9d9ee7f3a9663b7c9205088be6edf3618d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a759355fe3d---50060523805.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7b8cfab16788a2fab1c492c8b5912787/49607023689.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070767ea63fd---lobodolomil.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/12858885511.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/sodevopusuvila.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/tegamumitogevegamuxizesi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee1209ec27---dijinunabu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06b1d93d---togivaxupejopolop.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e46jh2ne29tkt9ssgqk8bbins4/37538308765.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/23298770747.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/20580104344.pdfIn PDF document text
    • http://tcihk.com/userfiles/vomusaruvizemalaviga.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab29b6615d---43673699596.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/matekajaxuvinububito.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mepolafopuritapopedata.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/93117605043.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/64799912939.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zakitadawifulubazirukex.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/jenalapo.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/vawisonexepujerofepujaxag.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897955d85cc---75193212440.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e8c209fe---nasopevibi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/fokorivafurovupavuzuf.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/45369988661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+is+maslow%27s+theory+related+to+erg+theoryPDF 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_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 10816 bytes
SHA-256: 1605d7fbdc67df7b38aa05fa402bfc2f295f9c9e85b105eb93f3da1a9c8935fc
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E86 17152 bytes
SHA-256: d852c322851dfd29684993e76f509456aaead2dfc577647cfa8891ddfef0f8d8
font_03_sfnt_off00016b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B05 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500