Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f162504504bc378…

MALICIOUS

PDF

122.3 KB Created: 2021-07-18 03:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 57b2941172892cd3e2f24729d06ca6ab SHA-1: 2cfe8b1ae3fb50e9d6cf1b5a5163dca54255a45f SHA-256: 5f162504504bc3784e97b548ae9d423cd022ecae9a9414c8377b74eae6ae340c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe3a8120b---18647931047.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fab8904ae7da3c6c5aefe55a5b745398/30831668284.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/60329136412.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210708091742.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/kopedisebibirijuzosu.pdfIn PDF document text
    • http://waterreducer.cn/d/files/papijavogaweno.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jotelodozol.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4d2fe0679e12c4107e8b9d42427e91ed/sareferuv.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ev5igot43271gejfq5j98psrac/45800006290.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb381a1dda---36343914983.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/22535904805.pdfIn PDF document text
    • http://lblussana.it/images/file/pisafinorogirexi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607af89cb494a---suvizezotu.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/mimufoza.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/joguwakatojizorigirobe.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bvrsotk48cboafc974au82l7p7/muvizejezinefomasujizuw.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b5752165b192a132dbd74260123fa8cc/nemabawinuxowisidigutimag.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/26474855368.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/11257090408.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/016tj4lkfphrvcvtkn0n143ib9/fovemu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/45285759433.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5d6t85muqoccof89g5vh6t0ara/puvotazevinuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+the+measure+of+an+interior+angle+of+a+regular+polygon+having+15+sidesPDF 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_off0001599c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AE 21916 bytes
SHA-256: 3d1e4c2169843e7cbc0b288fdc721933134765afd9f792a72360470ddc610be4
font_02_sfnt_off0001aab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAB2 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFDF 11388 bytes
SHA-256: 5ad569c0526938eff68d3f9be8e70d63f0bc398d02185aa7b43ff1fe3bc6d1fd

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