Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5b63f2be0dc503…

MALICIOUS

PDF

84.3 KB Created: 2021-08-14 21:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fffa2a80df733fbe786ae9d579d6774a SHA-1: 876aa58b12bb07a201d500a198a083fe5c1b681a SHA-256: 6e5b63f2be0dc50357b631cf2eb56498397bc6ae4c0e9dd9ebd63e4207e646e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous disposable domains, likely intended to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://parc-hotel.info/file/59924940452.pdf In PDF document text
    • http://physocare.com/Images_upload/files/bituwoviviruxana.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6c91e9a4b3ae95110c7c62c4e0c26557/sigetajukilizenokanujanus.pdfIn PDF document text
    • http://mimpi1pusat.com/contents//files/xapakiga.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6893c126---46001949968.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8db50dbb476a009fdc8c079db573fdb2/xutevarev.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/4771367266.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160711ad027288---lopagubitu.pdfIn PDF document text
    • http://svx.su/ffile/file/45574198029.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ddf0911bb690373b31efd79058cba2e/jokixuminaru.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tjfou7fiag3ilmviocatuhm23a/83955287494.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oebqe7addt4a9nhvd9muu6b2vo/bivabeb.pdfIn PDF document text
    • http://freeski.hu/freeski/file/34492841421.pdfIn PDF document text
    • http://standdominica.org/files/files/90778671864.pdfIn PDF document text
    • http://falerisztika.hu/tmp/33488266258.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/vibowobuvefejuvetudadedeg.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/viwujunizopakivinu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/93780443160.pdfIn PDF document text
    • http://megalaserasia.com/upload///68123888171.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/benopujegoxujozunuvuta.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f28613f41e194e5cd31d10866abdaa02/wevixedili.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/rasitenewaxev.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/96275352814.pdfIn PDF document text
    • http://chromavials.com/d/files/bewomirebumowupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=al+diablo+con+el+diablo+pelicula+completa+facebookPDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 18056 bytes
SHA-256: 27b5655131b644117d9d3a6095ecf28474572ad83b89b86fb2eebe197901711e
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 10828 bytes
SHA-256: a516aa17f5de40486185540a6059dd89ed05111f2d8c5d7af99b248dbfe6ae0e
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1