Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eb825ace4bc9b4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 22:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed7db378a6409d020c4d3bd9432b5879 SHA-1: 1d7057a0103506ce13f6b50a2eb158c82ebd5125 SHA-256: 48eb825ace4bc9b47e1c43834d7d082bfded42ed939fa1fc2bfa6ff1ebfc91df
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=neueste+android+version+auf+tablet+installieren PDF link annotation
    • https://www.stock2morrow.com/ckfinder/userfiles/files/546207649.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/84269143434.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c28eae565---65475493530.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gazisetapaxetobe.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tapikarenu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/45983942677.pdfIn PDF document text
    • http://partnercable.hu/files/82538788530.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161305919095e7---56673914597.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wofoz.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/55158094636.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56d856e8d---dakogulidanofafuko.pdfIn PDF document text
    • https://ms2oke.com/contents/files/pexedowefemifamoru.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/68035641282.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kodorapikox.pdfIn PDF document text
    • https://12shio4.com/contents/files/rasixor.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091119170177.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/koziraredotedimofapal.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904052812113597.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/pilodumam.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/47999781957.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/bagibijamimiwijotijaba.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/dinijadanulivekak.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/11924286252.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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 18388 bytes
SHA-256: 488b7bf1698032009c6e5b058e0685685ca0546e3042508ec24caba295b44232
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10628 bytes
SHA-256: 5314068c68ac01b135e4b18334e403451a7a40a6bc172884b11e0abb52375c86
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1