Malicious PDF — malware analysis report

Static analysis result for SHA-256 83078dc398b0771a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0443425d210f049297a3e44ca94d324d SHA-1: 65e5cc0874130ae4c146838541d2b7bcdfe028a8 SHA-256: 83078dc398b0771aa2ba325d3cc7131cb8d59fa4d704473e3e8e4c3e94143381
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an intent to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rpitrade.com/ckfinder/userfiles/files/luredaneruvukinala.pdf In PDF document text
    • https://aimara-bg.com/userfiles/file/xizer.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c006b765ea6---gidojo.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210804012334.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/zokifibeliwu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/60765246734.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd1736206---94885824960.pdfIn PDF document text
    • http://status.cz/UserFiles/File/73744152367.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/vizojuxumugagor.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/a1o993m1n5s8nbs7psffpjval0/45652805798.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91151661145.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/iflca96ikqj6hhhqfmhf0b10rj/dexumuzogozukewojoge.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/pumukikof.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080945b2931e---bamopamizunawarurugisine.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/93186288145.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/doruzigopojerotebofazajo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/57054790231.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/guvaxetumut.pdfIn PDF document text
    • http://grandfiltr.com/files/file/66863355865.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/28ed918ab70978bd59cb82fb66d75f29/jokasoretasukakumolek.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zowidomeligekizudidusudo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/asigisareboru.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24580789249.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc3f1d925---5568189949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=proform+1050+bike+manualPDF 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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 10752 bytes
SHA-256: d9216cdea770195a545b5b80247be10785af62c4e397915ad4c29f2cb92d23ff
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 17896 bytes
SHA-256: 26936272800f6dcd69c759546af63f65ac4499b7b62268114c0ff540a9effa71

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