Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50607cd9708de5f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-27 03:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf468ced75216e53c73a2de0f49ca09b SHA-1: 576c983f7d9cd1a3ab0d226045d07cba75a92d72 SHA-256: e50607cd9708de5fe2c738c313de222a2af70f23870aa911b63b8f34fc0de919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF links and the overall structure indicate a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://loveperfectionschool.com/upload/file/72926789410.pdf In PDF document text
    • https://csp-pub.com/stockages/files/runekexuwaleravuj.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gabimogafikejupe.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/6680130671.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/wugopiduluzisezolonezo.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/gotoravitutagilasa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/60185a0703283a1a90853c4ea38541c0/72372308539.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210919_6F5D4D0A940991AC.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eacdb6b861---vikanipekogunixunuveme.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/japujazonebu.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/86581073121.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/jizeruzipoporodedogur.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bb77363e6---64134242452.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/94637125213.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/saligipajidat.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/76441135361.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/67898800117.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/64483344551.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/49147463968.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/bovakonile.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/99568587886.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bobek.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/nizulifezunifavelinokejer.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/72ed3a32c4163ce6538611db93360c4d/dikoguzaginivudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+orbot+apkPDF 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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 10312 bytes
SHA-256: 3608ba25956b895aefe7e42c423a1945a34641b058db179c0a8789e5050b363b
font_01_sfnt_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 19804 bytes
SHA-256: 57b565fb4ac28b13cb68927006a440310debcf92a3be9a8e66ff198aab0a43f4