Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa079ccac49b71…

MALICIOUS

PDF

89.3 KB Created: 2021-09-13 15:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ed3a7a9967caa8073819a359cdac962c SHA-1: 9fe4dcb4ea8cdf6aec0f0ccf24e1d79e0f4bef47 SHA-256: d1fa079ccac49b718fbf828a317507fb6f0596f80377a87f043d3dbdc307eee0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=find+the+angle+in+radians+through+which+a+pendulum+swings+if+its+length+is+75cm PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133292ad576f---74298739799.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jepumenoliwubitubi.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/lagoturusomomode.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/33722eb1aee7da992e8ad12f54480387/lubabuzusen.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/tamopimisuvokazobomuje.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vukowodedumuwegedamoma.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/22696298150.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/8071073711.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofopuno.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/99293072626.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8b80ef11---42821693586.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/12691896113.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/keliginunekiwagonirupinu.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/33010221455.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/97711870729.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/vuludawim.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/gekesatolelofobiledateteg.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/82168248980.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905214602_j0afcs.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/51209242240.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b9b4b22d498652f597bbfc6e9308ea2c/zavexewajugipepo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wirefugif.pdfIn PDF document text
    • http://citranco.com/users/files/gabapig.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0f67683a---bekuxapijofujekebumerogo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16268 bytes
SHA-256: 781d75b0a67402ebc9e56e523ef248cb600ef0d6404a400638066bc9767f37b5
font_01_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 11412 bytes
SHA-256: 4d58a891fca9f2bc46c320fb11e1195d901fc2ecd86ebf3984f605286689d65b
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 22724 bytes
SHA-256: 9e835273758f176fcb9916ccec6bf1d5977c563ab9bdb9ec9917ecfd9e638de4

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