Malicious PDF — malware analysis report

Static analysis result for SHA-256 0513f8aafa788960…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 16:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bda48aba59bbd402b8a66995e72e4a2 SHA-1: ffd2951de1b64cf0eddc6dcea15503fe2b35b314 SHA-256: 0513f8aafa788960e6651f9255fa84815a1900a215a5be881733dd1c68851bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=android+10+navigation+bar PDF link annotation
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/5424241026.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/h9d7taag1o1m7ks2dc9lrbo3j7/30419796210.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/67381572383.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/85413554016.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/41604923819.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/47649670656.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furipov.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/sirinawulewekebeziwule.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/tivukumonezu.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/ribar.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/9994995411.pdfIn PDF document text
    • http://nsaimmigration.com/userfiles/file/namesizazikotapusosilul.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mepaxivadedagagogobufa.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/51275898973.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f95dae3bf7bf0a6d2823b83447effdaa/75020687942.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/panoxizabugoxoduwifimob.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/1622641039.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/rojimelus.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d2c281ec0781044b87ace1ea2342a922/79520003723.pdfIn PDF document text
    • http://eternaseguros.net/files/files/28945945242.pdfIn PDF document text
    • 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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 10436 bytes
SHA-256: 19f0d1c58320a528b36ec4962ad2db3fa9bd88605f81b8b151ff04dfe50c0484
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 18480 bytes
SHA-256: df9b0d84905f0391290ecedf093478f1b900e8667802a20da6c506e8fc202b6e