Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af3c4d909ebdf1b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57c01d999136c5732c15ba84da8348e0 SHA-1: 6f11f1d714285b976e5cf812a5c7e807802d38fe SHA-256: 7af3c4d909ebdf1b315f3ff0a66649d5181f40829bac0368b22df8ba6e42a3bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous links to external websites, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f225jedpmrehmp6qgjs15ficlp/momesewavupeketejiwita.pdf In PDF document text
    • https://rivieresoceanie.com/userfiles/file/faral.pdfIn PDF document text
    • http://e-hematologica.com/users/file/64265761212.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/42793630532.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7edb73590ef08d4fbb3b3b916a375a1a/perileporafo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa871ab5243---jizemojiwujamiveda.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/gigetoxudunatawasefenax.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/92238527995.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/42836879519.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/mozijuvabas.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1dad6fed7---29300860009.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/15717452732.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/ladawafivulijojosevox.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b91b527ab---jodubifu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/popigopokopefaginulu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/foxezegog.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2c95ece95c104d25c1808884231db2b4/57988944106.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4b2f370e---53876815587.pdfIn PDF document text
    • http://honda-vo.com/upload/file/gutasekunawogedolela.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/reloli.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/zusolukobenilupuj.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/565971ca4e1215e9182fd0f7ab8e01ac/wifaluvibenelewufapa.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109010309336056.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kijaxasisuxeketilewora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=runif+r+functionPDF 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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16224 bytes
SHA-256: 1531cb9a4ad27ae4198d4dce0835d271ee654ca6ca1d2ef908a699b4084361e6
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 9964 bytes
SHA-256: 99d7438d84909b94b6998ad0fcccaf906233ee855d783cb52363f9ea0762331e
font_02_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1