Malicious PDF — malware analysis report

Static analysis result for SHA-256 34da05c5836f682b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 287f44dc921232208621d57433a53e33 SHA-1: 757692298a0ac42cc56d5ce25d3fea7a90c7dbd2 SHA-256: 34da05c5836f682bb3d5ed2bc8800612c833a85b763543d7b7f12aa7628668a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://prosefkuchare.cz/userfiles/97444586078.pdf In PDF document text
    • https://trsoftyazilim.com/genelresimler/file/20029772365.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/tuxaterev.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/vevililapofimebi.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/24359282939.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/dowiwadivotejevisakipirin.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/88618672605.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca391b68eb---vezigotefujenigotebit.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/giwujus.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/57853571489.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/fikilosewekonifab.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/91000748934.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f7b6cb8b5---zaxizag.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202194949556547.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pavabofovonijoje.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/magamurevugasudi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161444e5344e54---70040404221.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/rezufure.pdfIn PDF document text
    • http://a-pluset.com/userfiles/47860796081.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vopevatupebaludese.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/29861379237.pdfIn PDF document text
    • http://intertravel.hu/_user/file/suboxowukugelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=curtain+panel+revitPDF 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_off0000b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 10152 bytes
SHA-256: f3ac9beb9caa136a5ffeb35e89617883c9a93075f1292ea828bd8d5f2dd2a577
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16900 bytes
SHA-256: 9e72c81806119f4cb9afc2f1272419c30485399cd01d74353a9bf8288211ac2d