Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1af2b0583fb249…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 15:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d3ef3186ce72fd585070cffd29a94cc SHA-1: a4181f50c401d6b1be052a9b00c3e43da9d42430 SHA-256: fc1af2b0583fb249eda6be7f919bb2ef67efc1c65256af4bb95376789ed9893c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ebsenglish.net/_UploadFile/Images/file/6139185873.pdf In PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2efc6029---sisalulev.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/raxevisebu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4a55ae50---tedadezi.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/81139840450.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/48709423607.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ef516a20bcca6cb40baeb7813a873532/5682803267.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80b2d46de---dupunibus.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a43193db432a202118f6960e48a5e4c4/bidizededofoxonusanej.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a4e22865e834c0383fddf57ee219ac1f/88549445115.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/15721518397.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/05201f57a55d77b85c6893930a1d8646/38832063389.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/43751798288.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e0e828b---60736608554.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/71bb3217ff92ba120b42da94e72849e9/zawifuzan.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92ce259c6---sovafetunes.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8c3ba681---dapupidenafed.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba01a81c2b---nuwurarudadigobisusibor.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88df14b38---nupigekutese.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/22b74edfc9425a0a165fbf7b09945824/vamaro.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/91280751570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=game+of+thrones+beyond+the+wall+iosPDF 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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 17656 bytes
SHA-256: 143a8884befea2160aff55923dbe36e8c03f39bf60cc240f34c83a5b2a7fe814
font_02_sfnt_off00013428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 10996 bytes
SHA-256: 315f90603f8c40e3e1d6a7c783ec91985ecb0a45a2e2a5ce7dd240ffa83507fd

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