Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecc9a83aaf1d75c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 07:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8d32714a8057563fa20b2b121e99dd7 SHA-1: 6709c94ba633e8925c53122542204f6e118d0af5 SHA-256: 6ecc9a83aaf1d75c53009695bd9c0200fb453dd6f7b6d65c95bc585da08ee71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hud101.vn/webroot/img/posts/files/96227664481.pdf In PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/67524213239.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/danavavaxefutagativeme.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/29733823446.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/13144335598.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/labowixite.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e08e419cb---sufor.pdfIn PDF document text
    • https://clinicscrm.com/img/files/bulizixajuzedume.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e418b414a082b521b61ac0beda839a6/94779595702.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/e945tg4lp843poc26kooiaom44/kavotipevomuke.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/78797680452.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b461bf584---nijetekewinibilijekig.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/90401876570.pdfIn PDF document text
    • https://parc-hotel.info/file/97981934494.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f245158b---vupidegututoriboje.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/fabif.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bujenijewijideteloxajop.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/39gfc19e4a5t31v9nfm8tornd6/jurirolosiwarinimi.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33444273547.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbbddaff6---gizesebekof.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/61d7dpl9hg18r8ts75caf6t8vq/8665495611.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/95318ec31f92749e8b0208d09149a954/90271473163.pdfIn PDF document text
    • http://isvpro.com/custom/files/83961655322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=preclinical+manual+of+prosthodontics+pdfPDF 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 17056 bytes
SHA-256: ffe294fe15bdd0bd9689986ed1d37d70fdf7252bf4f5b85af96ec83f00f34ad1
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10984 bytes
SHA-256: bb6ccf3f3affe967d1e4123e236f77ed520db25520536677cd391b21b8e9209f

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