Malicious PDF — malware analysis report

Static analysis result for SHA-256 7411aca4ee9495ff…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 12:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ba63b32bb392bfdfb157556135e30d6 SHA-1: ce94dffd6d6af9d601badebf685abf5a1f037bf2 SHA-256: 7411aca4ee9495ffc9c4cfec93693789a66a1aa4d74db54c13b466a83514f04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential for embedding malicious JavaScript or exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131730917820---1621253003.pdf In PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/16865093031.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/32058333510.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/46928612298.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lubudovixedimomobod.pdfIn PDF document text
    • https://kaimano.it/file/ritew.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/rofexadaba.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/80993103617.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/somuta.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wabamuze.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/44859130618.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7a0ec6a547a0f0a9de8b4fe1585837d5/lenavolalowasunenemas.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/73394365381.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908004832017.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/35521927705.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xipisumovedepodudojox.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0f010e78647af88aac6c3427085b946a/laseparuvu.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bodirajuluvekowo.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/39552620153.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/piridil.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/wusimoxepotobegafijejujo.pdfIn PDF document text
    • https://egca.fr/userfiles/file/livofiwigexomolupumeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=boku+no+hero+heroes+rising+fullPDF 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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10476 bytes
SHA-256: 29883899c541c49aaa6ca6720f69398f666e03bde002bb8d4f362e4aab8afafd
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 21668 bytes
SHA-256: 83878df212170664f0d82b76f8a04ba8ffb8d9c4fdce4febd1c47493d11b31a8
font_02_sfnt_off000134ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1