Malicious PDF — malware analysis report

Static analysis result for SHA-256 3841703e55d8ad45…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 08:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f0e414a978b0e471d921a1a0ffbf6e2 SHA-1: 8a229b200a5ab29726026e086656a6943c6b9c87 SHA-256: 3841703e55d8ad45c7517ad94849bca2f14c815bf624444d0f26f3a3623a18ea
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file functions as a link farm, containing numerous external URIs, several of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/lewizonetixuf.pdf In PDF document text
    • http://ya-ke.cn/admin/upload/fuzinowuwe.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/61470738701.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613864976e471---38746584182.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905181705.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/pikapevidudumesawugesuf.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1d5d977e---nugabokisadamuwefugu.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/reduwesaja.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/42685460166.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/19502920560.pdfIn PDF document text
    • http://sns.hu/_user/file/sujuzaju.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/81431397683.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/gojapakazufajilesarojofi.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/fuvureg.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/veguvidosorugogilafudula.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060505eef3---tuluzopeg.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/36766416559.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/dalotepadorimesa.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/lipulederutafaj.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/watiwej.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/11097090214.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/93371038216.pdfIn PDF document text
    • http://markone-tools.com/upload/files/67191476661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=calories+in+half+an+avocadoPDF 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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 10572 bytes
SHA-256: 9ee6633e26501ab739fd07ea8da6c3e8fa26730f2e830d7b77ca7cda7fdc235b
font_01_sfnt_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 15740 bytes
SHA-256: 0aea7d93cbe4963de865ff74b080a816f1d46d17906d0d6d3df04a24014a0361