Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfefd7335b83428…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 17:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60f02c46f459c2726639f76a096780c6 SHA-1: af5a175debefc60763fdcb7e5858b819ed95c2be SHA-256: 7bfefd7335b834281b512b12df71472be8b3960f201b17dd87ce76b438c87221
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The PDF structure and link farm behavior align with techniques used to obscure the ultimate destination of malicious payloads.

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613aece930b2a---vivate.pdf In PDF document text
    • http://rideco.hu/upload/file/8831589135.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/25bd2f2f25d375294de67017f71f8586/fanadezufifitirus.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/bifitimuvagiraga.pdfIn PDF document text
    • https://denimder.org/resimler/files/73476315301.pdfIn PDF document text
    • http://yuli-china.ru/d/files/siderawubututes.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/lajogiwujiwejese.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/80603865758.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/wibuwilulokimijupepuji.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/93678990824.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pv0c86a76dboa0dc6tr3apl0i4/32043539366.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jixenijikavefa.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/51847410716.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/68339108776.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/nipakasipujevifolurelajen.pdfIn PDF document text
    • https://pixel.bg/img/file/legiluvever.pdfIn PDF document text
    • https://alpinashop.bg/files/nujatotujimubama.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300355f2b1a---muwunetuvakulexipufiri.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/dokinetoxa.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/16614257787.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0cd99050---75725879527.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/zovavoponanari.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/4641106784.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/25328239588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=name+the+eight+planets+in+orderPDF 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10816 bytes
SHA-256: bf224db232e6a4ea837f199a8b191c6b776a29eee0793dfaa59ca4ebdb315fa0
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 18144 bytes
SHA-256: 5d834dd35286b8d071aaa8d2fb0a04c848b64119cb5e07f3eeb95048b1fc92f6
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1