Malicious PDF — malware analysis report

Static analysis result for SHA-256 a490cc8c43ff0a88…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 19:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 501bb2c7a45d177d35ebe2a5728f80e9 SHA-1: f2214cea51e241f82659bec72788a15e5a8f4a93 SHA-256: a490cc8c43ff0a8863257e4c673c1ca9c6de57d2c17e7375653ecb0d7796cbbe
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://perfecthospitals.org/ckfinder/userfiles/files/35389170640.pdf In PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/besusukoxajuvatikazes.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/gajirerilimonogo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zogulobovipu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0f4f3b52105f555f18eda01674732575/dagatasarulakogevo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100db0ee0de1---43848121431.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/rapagesexuramawovaput.pdfIn PDF document text
    • https://promise-land.com/upload/file/fufivolipufidoxij.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/walojubarosora.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/nevujowanufeta.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608935ef7a64e---lekino.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/73722336154.pdfIn PDF document text
    • http://royalgroup.at/tmp/30112660544.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/7741150254.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/97qvd5ejcd8jsoihen9sn2g0r1/zidilelir.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2btqdnfm4l8n0pikfs08t35nqd/jafanevo.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210621151216_zgbgb5.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6f07b4952---37499612129.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dba3e56f73c9e9e9b20a1741bc3a9c6e/xozole.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/30574797279.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jiguvosikel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+pdf+app+for+macbook+airPDF 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 17696 bytes
SHA-256: ec410b8d8d31d9a34a1156570d19ae9afbfac461d3af2581b984caae67869f3d
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 10916 bytes
SHA-256: d29cf5ab41d66ce00a9f4155bcb09ad675d1480453059302ab3498c4af95950d
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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