Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cd3afe249f0e20…

MALICIOUS

PDF

79.4 KB Created: 2021-07-08 12:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7f7901b2d4b61b0f6dde93631d62b14 SHA-1: b06838b622f72fd409040cd70205c58eba7e7196 SHA-256: a9cd3afe249f0e20846bd5849f54ff6d0328bbc26a04fd84746dbd38dcd191f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f1dmg9p0i3c35787eapft3cgq1/purawobiz.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/kafelivozaguf.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/balunajivirireduva.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/zaloj.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vtqv63s71j45blkvhr0r85r8qf/18125938313.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096719ea220d---xugemesinin.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/vizele.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/5739657836.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c566420e8---90807949626.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160886fb08dcb2---58511583015.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f8a6440f8606ed9c1bff419cc85ec450/fozasuri.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8e355a01---zezuvilivakal.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/32fa8aedd71cbe99cefce8cc9770dc7f/63251533521.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/nezuxutupowi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/766f5a6a17506a7b6603379e1147a299/54394485148.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/loborudopuzanivavimi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ded5953ed83---titolanujalodotora.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/59913670884.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/95126312810.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40194158541.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/39998514042.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/59401212434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=why+do+dogs+tails+wag+in+their+sleepPDF 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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 16116 bytes
SHA-256: 731ca1acc9a12820b7948f4eabf5ac087b9b4f63604d367903d4abb130a576ca
font_01_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 10864 bytes
SHA-256: 06947b66239bacb02863e633cff88cb812521d24832501206a830e652530fd76
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1