Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f62c32b22b3386f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 10:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dbd9013e2b6e78e6a59b06203fbcbafa SHA-1: 560713018a0fe73f67c6e0edce90badf11d01097 SHA-256: 4f62c32b22b3386fc0a34d54373bad1f3c7bd9803af143ca8928b0928ed1809a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution disguised as software cracks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eugensa.lt/app/webroot/uploads/userfiles/files/gerakagosoresilame.pdf In PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/74700087356.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/21873885555.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/52153054006.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/24973491442.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/73323850500.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/76627fa7d1f122f3f425ff46225b4152/motila.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4358233334.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/verigugozurirebasojisa.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/10759938975.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/34651648945.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614874fcc3c4c---50623961215.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/besaponedomiso.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sizefamugowubovodi.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/galusidap.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abd0b8658---91866858706.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/88605766675.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/dasul.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7821a520b2edfecee9e8d022de83dee5/mavuxufoduru.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/67275639241.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109140635374008.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/kifelaladiwi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba8159b65---nosipavur.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/70605012335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cs6+crack+downloadPDF 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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 10420 bytes
SHA-256: 87d335441debfa5b38e66a1ebc8c6470e8aa4f1e29ed53b6ba88a946cdfcb8c0
font_02_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 18608 bytes
SHA-256: 2bcf07e753301ba9f9cbd868b9a88616c8c0c90b48395c6e150165bf96b0bb86