Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41aab77f9bb3851…

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 01:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be87a8376488cabc7a3f93b4a207ab65 SHA-1: f601926984149fff335c4ee75c7b3264e36d7a23 SHA-256: a41aab77f9bb38514d4bd302bc2dab3827ae55448e53ad9f6f28827ac5d38060
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The presence of a 'download button' lure further supports a phishing or malware delivery attempt, likely involving JavaScript execution to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hosvagyok.hu/userfiles/file/bamasawewawuzufejo.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/af2f98d11cdd6909b75503fcb7d0c5f8/pesevivematoxol.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tuwanefotezawab.pdfPDF link annotation
    • http://btfa.tw/upload/files/ninoxivizalekulixulizak.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vtdt27n05f2b8pof37sff19f89/84261525245.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hscg3gufospomj0avckbiiokj2/notizodakifuso.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/34801569123.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2906a673---zarawajowudovubi.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/bovefakipaga.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/sajisibinure.pdfIn PDF document text
    • http://apothepharma.com/upload/files/xineladibiserepomipiwaxig.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ded78823e---pupiruzajisujakifulevod.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/45e83d0cffde19fd819bf5c3f06a824f/vobiwotubuxena.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7coalogs8hus0semhkk5dva32/68600795142.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/67069181827.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d07d9a834d7---66257389248.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/xitexinubuwupaxu.pdfIn PDF document text
    • http://malifer.hu/upload/file/koxokunakejagowujidusek.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f3c980307---54138759235.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c031532fd0e---14445387035.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/64466506786.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/50c2653ecc48ea3d90831bcf32708095/24102747466.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/142be1fb3ea0a642a10663cdd7cf7ad0/pevifujimaxotaneju.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hv2fdphg0bv86jdqat0mpqasi7/97335733662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=economics+student+textbook+grade+12+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_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 18652 bytes
SHA-256: 18b5d9e9be1c40529259e7bb427bddae7603222e629f824fd1ae8b1b08d12f4d
font_01_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15108 11504 bytes
SHA-256: 9d456baa9f6f3da440ed67938f39006dc529625e0dca7285d9a7ff51caa4d132

Open this report in the interactive analyzer, or submit your own file for analysis.