Malicious PDF — malware analysis report

Static analysis result for SHA-256 765931e6424d9756…

MALICIOUS

PDF

90.7 KB Created: 2021-09-07 21:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b52ac46cb5c50032459ca477d302472d SHA-1: d36817f848ddc031cf4e565224bbf8ba452f7cae SHA-256: 765931e6424d97562a0f26474a0133b7f0bf724350fd881cba4bcac21f251867
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ceccarbotosani.ro/userfiles/file/98726089044.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2c29fe65---kikuwagijekopegikadozafa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurirekabir.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vimikatozuzepekumaxur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf32a9940a---93160875704.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/16171482332.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83927805848.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/xadebaduvazowemudotevati.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/jojedujusezomefova.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/kamevogisuj.pdfIn PDF document text
    • https://kenadong.com/contents//files/ruzebe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s8cuh9116be1qka8hp98ah0ljf/megifafuvenigegamifuladu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/4845277312.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/12083485718.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/50566456960.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d67990a87---47314019739.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/rapixudesi.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/tulipiz.pdfIn PDF document text
    • http://lg-palette.com/upload/files/60552648251.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kigukutekuduka.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/59f43c0dee133a34ca84fd42ef8ab28d/zifetibixirutovigur.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/walitegedufadipizano.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/napunituxelitizanefij.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/808d556dfd85c981ee7f16b7b75b14ba/38189491607.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/69695588393.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/jitanunonetetemufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=auslan+sign+language+alphabet+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_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 18740 bytes
SHA-256: ac05873f7a647f61faa11449295f054a3596c6d0df347c8e5eb9e77cae72971a
font_01_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F5 10776 bytes
SHA-256: 14bec731a3702c59e058575bc9aaf253476d3d4fc8afa865de60c2fa0f59518f

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