Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a9a7fc43f5767c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 06:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 305b4cc7f4d6ef099ee9d7dd745c3fc4 SHA-1: ecc808c958836219865244a1801b37f00548d0c4 SHA-256: d9a9a7fc43f5767c10a22234e86b812b67b5b6f35dde0503eb55f3f8b3c09716
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, potentially to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hyunsin.net/userfiles/file/31568167817.pdf
    • https://mm-podium.ro/userfiles/file/25980993253.pdf
    • https://peintures-descours.fr/fichier/files/niwalisomosuwaxofisoz.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/jisatotemofadoji.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32f28e276---baxas.pdf
    • http://thy-environment.com/userfiles/files/37419795025.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8a57ad26---virogosinelire.pdf
    • http://nacyc.jp/Upload/file/47346747262.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/wusituvoroligefav.pdf
    • http://pieseclimaauto.com/files/file/dosuvejanitawuwewikuruf.pdf
    • http://machinegroup.ru/img/outer/files/gezipidolo.pdf
    • http://wakesup.org/userfiles/file/sutedusuvimuki.pdf
    • http://kiiga.ru/userfiles/file/rozogujunipu.pdf
    • https://jamurgoreng.net/contents/files/54385760255.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/bisilalidisevuzigopi.pdf
    • https://rosycaffe.com/file/11892122712.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/noxidumak.pdf
    • https://matfplayer.com/calisma2/files/uploads/12366942108.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/kofarotavurufifaxut.pdf
    • https://banifatemehmashhad.ir/userfiles/file/76039729247.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9988c5d8cedcb460e29e3c1daa2a8640/30464392390.pdf
    • http://sushimura1.com/uploads/files/gebupagorogere.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=top+best+video+editing+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df54.bin
4c275337983ab8d8f3b06ecd59d8459dca01ab95145967985c65b49b8c5a118c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16732 bytes
font_01_sfnt_off00010ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 16792 bytes
font_02_sfnt_off000122c9.bin
a98e5eb19d93f39668bd300df9c6cd2254bc5cdb8f4828722d6b7f19022a3516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10796 bytes

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