Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472c6a507893560…

MALICIOUS

PDF

102.6 KB Created: 2021-07-08 00:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42a460cd5bf09a48261a428ec70cb09d SHA-1: 8fe7ad57f34bd75b4828c2c4e4c30a699aaf491b SHA-256: e472c6a5078935606b235072b5b635831b4d9aebb61cff9ba219bab6d7a58bdd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself contains obfuscated data rather than readable content, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e4aa4986a5e996bed0e9c5a7e81142dc/mozadopofagejivusisek.pdf In PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/71135244275.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mcj5b0t3r9dvqi04ra9lpdbqi9/modedalon.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2298ead5beea55416eabf55dbd852cd1/jujiworivusudupibuzujovu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98bd9d2964---gojuxevexubevasemoz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced3f971dcd---8667009500.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42796311449.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03a0d2397---69420670178.pdfIn PDF document text
    • https://cape-electronics.com/media/file/likovufumo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o8arcfhsagiql07b45bpdv4cj3/jelowirupor.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/sijel.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ddqbe27ehoom83jeje4tdj4tdl/wibera.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7d4f394af12e2d558420bf057532f2e4/suduxi.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/8894319437.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ddffd858205---7587170247.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c643c57e0---73483486158.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/79ea2be5455c96e5e250887ef6161f90/komederasafup.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1gm378q8j1pelp7bibsh4ke02r/mipofonojofaxopu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wigoragadazib.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34e20e425---matewupige.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/11436033064.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/48286708819.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/516098325.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/tonomukorup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linear+momentum+meaningPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f728d29a889bc7872ac063660e195702/ridutituridutivokaxopixef.pdfIn PDF document text
    • 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_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 10292 bytes
SHA-256: 4f9e1e8591a19059d6dc46bcf666f66cb7fd7193a681290f4ee9114fd3ff4962
font_01_sfnt_off00014615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E27 17840 bytes
SHA-256: c1d0565e9b916f4a2c1f8a7835a06c565fb8d92224a6a2fbf3b1e286d27c30b9