Malicious PDF — malware analysis report

Static analysis result for SHA-256 b327272c48e3d835…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 02:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 773b5113c91132449c4cac9c24377dff SHA-1: 7ac0c051dc52d6f3b9b89c28876dd8e6331533f5 SHA-256: b327272c48e3d8356c81876aaed5991fa8a6214b3acaeacde8ec6d36bcb5a44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5fba502607c8f01cfe935a48f8f80380/metijagikujajitagogewomuk.pdf In PDF document text
    • http://shinies.ru/img/lib/file/semusolazigitimupuga.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/61662378770.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jefalizopubotilutelo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/winojatuzomudile.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/62649835262.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d350595c9896a8d779a10e3ed1728a9d/20925152140.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bcd5ef1f---sijexoxidufoketo.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/83108ccf2e8c7541d40b2f602d2eee6c/48379805507.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57610003644.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/18896069402.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf0aa64c8dc3e777fbeebaaa47fc26ed/58543963728.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mjane36cmehik16roof3k49mje/sulenukibab.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lonaxezexajarobidisel.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/65206911120.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/1403099053.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c95a209e---bumusabepexoxi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hh9smguej5h7aimp19e5ajnrl5/73684549034.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/76074889537.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940bb81c564---dodomumipesibujob.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ponerufutawub.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kadifesibewajupenafod.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/46258100190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=takeout+food+nearPDF 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_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 10196 bytes
SHA-256: 7d2db0ec0e2f7f679bcf2efec99609be5e2ced36612053b6059f01a46c010f36
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 17852 bytes
SHA-256: 96f55c308453883c24a8ee8546e9d586771c6b7377571973eaa462e95157d1c7
font_02_sfnt_off00014ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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