Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a4e449a496b756…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 07:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acdab4e7c0af1e6c2144139f8a591b6c SHA-1: f1f2442750e4efebf8b7bdecff36013efb11b851 SHA-256: b9a4e449a496b756cc6001418da4590d6328c410c4ccf2fc6d55cb27012907e6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites, including one hosted on training-solutions.ro. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e082012d15---vuwobagidiwuxulo.pdf In PDF document text
    • http://phubozena.pl/userfiles/file/rabixene.pdfIn PDF document text
    • https://satesayap.com/contents/files/fufoguligixadulojutenon.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wogebokuruk.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/99159132879.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bslut3m4a0k11a65ds9tk090n2/mavizezeribirabofu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hbna6i2o38uuamh3i97ca6ue27/tivudujozasevuno.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/4952675233.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/fuzobozapoza.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nojuk.pdfIn PDF document text
    • http://posuni.com/userfiles/file/budisaxenutifusefenaki.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/8652630654.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/nugabazaxobimar.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902165100648523.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/58593161421.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/devitibedopud.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/38838453832.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/1180905682.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/82942819156.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/nozuwew.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/70f470dbac4fe215833161903ce578b1/50063202841.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/12207286477.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/469c87a69d2f8a7f536ae30e7345c657/88129245321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mega+man+x+mobile+apkPDF 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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 15668 bytes
SHA-256: f4230b93f96d859d18b55b1bb7181c33d9270be98dbbe236ed2a26b44f704897
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 10556 bytes
SHA-256: 97b6b21819996dc1f45b8f6df6802e674688cdaaff47244bb7e08b8f4961949c