Malicious PDF — malware analysis report

Static analysis result for SHA-256 90631499c4b6762c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 13:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6245150c91484b475238b45008279a8 SHA-1: 22228955168d369ff90a5e43fd189f32e20db884 SHA-256: 90631499c4b6762c22c6da312b020e77e64c4fd1d14dcc9f6776f2d06ffc010c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=terminator+salvation+android+game PDF link annotation
    • http://levant-tekstil.com/other_files/File/13718804368.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/49818740435.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883facbd8---67826438832.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bde27e9f---72888537266.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144d23f27393---zanubadijenoxoro.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c41e377ed06d8acbab5011440768ab29/nojozefefelukinodel.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/wibijeluko.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/25044035875.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/motojegovuse.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4antr43rfe3727fnig181lgpjc/bulakobavume.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/86225288240.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/39879273514.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///petulerufugujilewar.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///97167302933.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/8551100079.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/tinivi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/radozid.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/sojosazulixilam.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/72268374661.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/tikigaxunoniwojobolano.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d346949635---rugakupakute.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613117a1deba0---29756506606.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/58d2c899ce4524e9db470db9a0e6879a/natuwipixitodaxiwitefe.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210918033547_1543866418.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 10620 bytes
SHA-256: 0f1f8ee10fe6d955b01194d967c7fc6b549600d2f4c061c5f335ed158f2dc0dd
font_01_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 17356 bytes
SHA-256: 5dcee49b75f8ffdec4026a1eaf6dbfe8a7c7fc037ed36212ade7ca87433130f1
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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