Malicious PDF — malware analysis report

Static analysis result for SHA-256 249895a0a1326b90…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 14:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33c82bcce1976f45f893d14de49a6ea5 SHA-1: 4fbe7309109b6c8199dc76eee460420b9d9107d7 SHA-256: 249895a0a1326b90364742ee86a3a4f33625940f717ba019e24fa0102c20aa07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://asiarsolutions.com/userfiles/file/vekered.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc995c17c25---wobezowo.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/25176927204.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zalovediwevakuluj.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/50d65d4063d62cc37ec95823119ce94e/95798277660.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7c04b033dce6f8fac010bc1d7cd2e7be/88538030906.pdfIn PDF document text
    • http://artside.org/data/temp/file/51490460484.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4p58i76ch2t9utbdlor9r4a9cn/tapipizesovida.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/50317031840.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/62938309000.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rebanoxiboreverezeni.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zopijasiderirodamimozi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161203f452c8b3---desasaradabazutosomeg.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2lur6rkiiecr2o5jbmcr8l0b0r/nirixojamagabosozo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/52488001657.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3a6da4da500ab9fbcb7710bcccad5b7b/93179243291.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fc2621716a5d86ba10d6c1ed121536d3/64620428037.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/49397741566.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/jomoladabug.pdfIn PDF document text
    • https://norservis.info/files/files/37810393715.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/42264094820.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/92735981704.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/008cd89b50ba687252bacca654901bfe/rojukirurumexoruwo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c259b909721---wofezozipofufesewam.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88030551714.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e144124e---jaguvapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dibrugarh+university+holiday+list+pdfPDF link annotation
    • https://b2cdemo.tickets.com/content/files/97641350003.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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 16148 bytes
SHA-256: 769c25a3261bef9721a5896a8de258e078951772d063010d28d52485bbffc731
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 11196 bytes
SHA-256: 7a568b043721db09907fbb5c975094d79f3375bf28c7d1991d845396540c6c67
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1