Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427620963420c9a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 14:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df8b280fbb0fd2d552e343235d2e0389 SHA-1: 956ca1803da50830b80d9a7f51a06bd42a39007f SHA-256: e427620963420c9a694ce406f7708c761f1e3e0b1d3cf3df430d9f9777b37f3b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sushimura1.com/uploads/files/56922228171.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd863da5b0f99afa9fe54dfd1ac3934a/jilifemo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130738d21190---21378202618.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161388f890e9b2---45194035593.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/44580618462.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/wokezadeximuxorekepesaru.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/32432825927.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/94197643094.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13412003233.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/99401395292.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jezolitixekitexegoxu.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/bimonasuzibenudoli.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73431953391.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94159726484.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/natowiginepelilope.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/60709510943.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/loserexutiwapok.pdfIn PDF document text
    • http://vkts.se/userfiles/file/50528746181.pdfIn PDF document text
    • https://dacola.com/upload/files/mudifuzuzofageta.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/jexan.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/dizonagutubimobitibefuvo.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/nolagipaxumina.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbdfbf40a---62441667946.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fajuzuje.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/17696704378.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/7803170892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=torrentz2+telugu+movies+free+downloadPDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 17792 bytes
SHA-256: 632de2da2849b04f5a08611369b95967086f2bc09e2977bc6022360946940bcb
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 11092 bytes
SHA-256: d6a4253dd245455c592881ee5b840ee75db1914cd78aff6eb2d09f3ef89cdf20
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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