Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc839cf6baaba229…

MALICIOUS

PDF

82.5 KB Created: 2021-07-04 05:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9104ed15d20d31c0a5300c6465b1884 SHA-1: 454e42c30bf8ba2965b709ffb557d3281101c386 SHA-256: cc839cf6baaba229c6b6f40dde53564a3d64842053e3e19981379d57455e8169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent of directing users to potentially harmful sites.

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 https://krisoc.ru/uplcv?utm_term=acknowledgement+for+ojt PDF link annotation
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9661c8440b5d8f0da5a29efaf8ae4d40/borazurone.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f47814ded---71953149461.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7ad5acfa227827922e354cc816bcc3ce/povutemipogubonoluxanakab.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/sutikegesafopijewa.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/11849467736.pdfIn PDF document text
    • http://www.buildonhope.org/file/maxubukefupopulusufedaw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a6f71bbde---83421567752.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/39312672945.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/lilojotuxikufolerisetor.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/39325680762.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/negexamebumupowipivofawu.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/24241002455.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kuduvemep.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a26ea4cb1e82a5ea1aa6492417206f36/32662284831.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7btdij2j56lacbfd1qk4p6po18/ravogafiwolejem.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a351275f72e---togurisesepip.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a7939a7ce4aefe97c9691c7d8d8f3777/86715157714.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/74320151591.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6774b79e---84975703508.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e262a1f739---tufiso.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/48654579939.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859683983ec---43680840961.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaecd3158c---97428678219.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/zuzupe.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/11014400321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10684 bytes
SHA-256: 2462482ffff3a1e3449ce959e52bc77579c96c4b4df88e93b771f50edc494ab0
font_02_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 16384 bytes
SHA-256: b3698b05e82b4157b69981f1f084b96a6ef5a9a66ee171bd87642917fdfb8809

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