Malicious PDF — malware analysis report

Static analysis result for SHA-256 90278aafb1c3aeec…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 09:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e81f43ca91940079e4907fe90f0348af SHA-1: b8adefe94b31996262a798a9bee0d9bf4f00c7d6 SHA-256: 90278aafb1c3aeecd939498d83db4871bebbe216a61d0af92947e585a44d6c8a
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 a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://catamma.ru/uplcv?utm_term=comics+pdf+mega PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/67c642dc51d00f24d9f37ae28e83e5bf/17396474693.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/83347000406.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c457af15---pekanolinani.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/82507033298.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/viruvijusirimela.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/tizajekalizazoduxapu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404e74b6422---22654435840.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jumekoguxiwuv.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/39092181823.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/lakawugakum.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/73086243145.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/kasotewotijujigerimefaj.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/saranovepij.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161370792d8cbd---51857926037.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614173cc25cfb---zupuxitalozutudow.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98062723929.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210913_C5C6B60B88DA5513.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/30914823376.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/bopesibajal.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/9739792376.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/bedajibujavedobu.pdfIn PDF document text
    • http://lactopad.com/uploads/files/8846089541.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7093cb14ef4d7b5ede7525a3165016e9/71074650453.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/lalexitokutol.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc018cb2---48662697278.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/womorolomuxevizamigafew.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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 10648 bytes
SHA-256: b3ff1fc5d50770a33bdb544562c0822a0fd5dd2bf75a80715ddfdd8694a4b7aa
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 19240 bytes
SHA-256: 51be34b66f72e399ad583dd6b6cd922ad03d2e1b48ff9acf3841d376c92934d7
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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