Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a550ce5ec996d91…

MALICIOUS

PDF

77.9 KB Created: 2021-06-27 22:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c366fb3880a5d852efff5ad61eb8dd7 SHA-1: 0df84bb2549ea1a90d0bf9fd12e9518c50a84c98 SHA-256: 8a550ce5ec996d91f816d322bd3829dc29d58b1fe77ebf1807adf291382b44dc
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://drafthe.ru/uplcv?utm_term=evolution+study+guide+answer+key+biology
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b86705e4f---towizudir.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6b78da8cf7c2d963b777c680d7cf38a1/10994119021.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b048690ca6732ecbb2e293766362621b/78322312871.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8k3stia0etma7p4j091qinul0n/99111248071.pdf
    • http://batiment-tunisie.com/userfiles/file/62886910094.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9d73bfd3b---99705792084.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/6307323075.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d7da8a42---zudiduvarebavokovegon.pdf
    • https://reparationmobile.net/userfiles/file/29190439699.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f23cb67d28cfc436308bea48ec833cf1/41014350514.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2b96a1a---16837946929.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48716f6d9---68926116313.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b331551648---16532631994.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b517c22677---64504798144.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083024e97f48---21729954309.pdf
    • http://emirates-offshore.com/uploads/image/file/dazixasodupisogomivi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586aa2d12---92428996740.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd345e0ce---53027269466.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0v5fmuj31b5gvn924uqhoqjtu5/tabikaxijinojosusaw.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607455fdaa0d8---medejimo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabdcc7031---49642985026.pdf
    • http://consulcongress.it/uploads/assets/file/67287567009.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 16792 bytes
font_01_sfnt_off0000d109.bin
0a85a52a90549498473042f75707838c7a90c24bb1d0c52a7a783bcf32d26366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 11004 bytes
font_02_sfnt_off0000ea97.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16132 bytes
font_03_sfnt_off00010004.bin
293fb2ba0930032da5bc49c6a153ec49848b147f04e69930a5a7f69fd994b760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 16292 bytes

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