Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba73947a4085a65…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 14:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5000eee06a20cb2b6ca4b153332af177 SHA-1: 63b7209f23e42e095434ed3b361306b8bce14f61 SHA-256: aba73947a4085a65e76922bdb928563458bc2aa7bae6bac251e72fa4a09edd21
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to infer a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://savoie-outils-coupants.com/ckfinder/userfiles/files/30324615691.pdf In PDF document text
    • http://abwlondonblvd.com/uploads/files/38921419901.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/90213929301.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/dawetu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021962257452178.pdfIn PDF document text
    • http://olympusflights.com/files/files/62491835835.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/16627831922.pdfIn PDF document text
    • https://brs.jo/userfiles/files/22048162453.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/48446757769.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/30114005767.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/16889047877.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362edbbc99e---19768288427.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/jalajebowekejotunasirup.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/76760382017.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/bemosafofabivi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zefapudosudekefeg.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/1415066510.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/wividitugevopewezavo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/nivuseredixet.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/wakajefawutirurubu.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/43559090784.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec285ee348---10064893885.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/binofibovadonanafolagi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526a5e6ab---zitepisabobudezige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bellcore%2Ftelcordia+%28sr+332%29+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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 21808 bytes
SHA-256: b15ebe079140b56fa7e1af402b5bb3ec7749e777b8bb271220dcd7ef3353508d
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 11044 bytes
SHA-256: f704d4e17247ea6ebb6f17131ae3bd3992d64b0ba04a9c88da6258defa9ce651
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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