Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c263a4740c2d1e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 09:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f07cbe16043603bdf20920450898b0b2 SHA-1: cf3d7a15d4f50a0cbafa66d11253829b44797fdc SHA-256: a1c263a4740c2d1e051d8171e6423893214a230b188dc54b9d517df50a3b9c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised or disposable domains, designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature, suggesting an attempt to manipulate search results or distribute malicious content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://trunghungplastic.com/luutru/files/3301173987.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6036c259e---51570842417.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/mezipifuwewemo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091017561480554.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nozijibumapidebizewog.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090316307096555.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2b4996fd565f2d92d767ad00626e169d/jadeze.pdfIn PDF document text
    • http://tencanpowder.com/d/files/41506732215.pdfIn PDF document text
    • https://path.mn/userfiles/files/rosiwiwumewovizelewim.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fowedapagumidurixotowoza.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/7097677557.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/28394424304.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/dosobiwopeweta.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jomubakinenel.pdfIn PDF document text
    • http://uhorder.com/upload/files/70765586090.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42455300077.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/vinepukejejuvul.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/koperisepuzanuvav.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gemezozawezozejeruxegug.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/winusobunedididapenezoxa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/431e393456b5f23ef5ff4c158e5520c5/27189563892.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51057493107.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rurubinokiwalirikikajinuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=family+island+farm+game+adventure+mod+apkPDF 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 20324 bytes
SHA-256: 3c457e09ca34307f7ee1f2f8d4e998caa14b75b3a397f41a17e52730afbda85f
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 11188 bytes
SHA-256: 43885394c30cc876589043b1eaf78c082a8b771ab16054efd49fec6796b00707
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2

Open this report in the interactive analyzer, or submit your own file for analysis.