Malicious PDF — malware analysis report

Static analysis result for SHA-256 a110857a9f1b7fd1…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43a5c064b4ec1d4e8036cf82cffa26ea SHA-1: eaf7410ef768eab59900544c6d6837d36b26df6d SHA-256: a110857a9f1b7fd18c0ff3888e1b2d1c17dc10bc203887922ca1f989c90f1d8f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=height+requirements+for+animal+kingdom
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2p80htjfgfsqiqv42t5799t409/20275961491.pdf
    • https://airflow-skateboards.com/upload/file/tixadop.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/715e275a75cc99da3e6a6d0c87c218c5/45014295130.pdf
    • https://alnahamgroup.com/userfiles/file/16388117857.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce56d533cd---nukezabagivi.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/19ee8d9f74a13e9ca1ce87f93d373146/bafabewefarawulejow.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbbf9efae---vetomabevosi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689f198835---wozujujedodubutifetup.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/zaxifaxado.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160901c409fe24---fuzusavoripalebu.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab819d1cf60---sajudefubabovoxigirevud.pdf
    • http://jncs.kr/page_data/file/20210627221132.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1910288d3---jiwajebubav.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a825a72c29d---88632459258.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9e6701db---39991837793.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9150763028---pesajexel.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8b53311c---zidipisivumuligulig.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30586755c6---jemizalaxosivufa.pdf
    • http://rogo-rotterdam.nl/files/dewewapupaxi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c303eab28---jikefevowemefotikamur.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tm93b1td72m7vaee85h1lv1t7h/70889660435.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gdegq9dptjt29hhcffc0kncrna/lizixebomiga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92b.bin
e28a5797a84f24c95fbc7dcc796de21f780f418dcc14d9f79af0f3a308f58621		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 11132 bytes
font_01_sfnt_off00010265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
font_02_sfnt_off00011a77.bin
98f40aa13493660d033f8b72eddd5cf90a9ef916c4f6c3f55639e984ec0b805c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 17104 bytes

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