Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaac79d41967848…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 18:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 819b00ec477551eb3735320376fc8cb9 SHA-1: 5bf888d1b927313b98fa07d39676e2ee8329718b SHA-256: 6eaac79d419678482ebb89ff5e4616bf7c049195d4ec46144269b144eca0ce86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while numerous, do not provide a clear second-stage payload, but their nature strongly suggests a malicious purpose.

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a6d9af7dd614570d5f050d0a42f6291a/8299567484.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/isegu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614192cf1eb6f---19820640545.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372690e4fe2---wuzevinofisijaro.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/luvijapozadorusanibanosa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133525103168---kumakad.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10eaf80a1bf99fc70c061890ed591fc/17491856873.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/torotetowofugujitak.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vonewadaxamagad.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/68774325806.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97688994910.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/96629396249.pdfIn PDF document text
    • https://lorus.rs/files/ruxapu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3553b4bf3---titalano.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971421186435.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/pinorawedonupazojitiw.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/56032941991.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/71556046218.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5k4028di348v786vf49b69jka0/74609721319.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/mirazanaramofatogirobor.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/36904027679.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/89309646347.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gelepigaro.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/nonovapejatekam.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/36901896906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=plants+vs+zombie+2+unlimited+moneyPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 10908 bytes
SHA-256: 2cb2474593af0c597dc14d007d8b0ae89e214116f08197bfc69168980560c03b
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 17932 bytes
SHA-256: 0641d9709aa45b824a2a27e7bf14e8a646b043b15a10d431ea877c733f22378b
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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