Malicious PDF — malware analysis report

Static analysis result for SHA-256 4675634cfb2dc137…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 13:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2505b7a845de340bac4a738c9bf3efaf SHA-1: 2a1835fcf2faeb722cd0fea5439d16e718acd50e SHA-256: 4675634cfb2dc137b82ec98692075f15bc2c84c893f22ceb03e8b1300032f2a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://drafthe.ru/uplcv?utm_term=transfer+pictures+from+one+phone+to+another PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332925117f3---21789057193.pdfIn PDF document text
    • http://sns.hu/_user/file/tegajovuxasabejejitazije.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wojobadoxaputiki.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7mm7v6p3aeapjarq927cu76qlf/wixan.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9213a27d60cfa462957caafe74d48454/12124046914.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///94782236829.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/99579788525.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/54851174901.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/mapevimajavago.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/walapifawulepalinu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081253047683.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/pinekudoxovu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/67521342966.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/64170616433.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/28253025144.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/49157823986.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/pesomonagobux.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/lamezuxijokuberagako.pdfIn PDF document text
    • http://aimic.com/userfiles/file/12995718459.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/60013119210.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161379abb85b1e---vafezulidexututos.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wiwirumowipeninovi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xuwozijoruwifaxelabov.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/45182045471.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/sabanilimuwaxifuwaxupu.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 18828 bytes
SHA-256: 00f15957395e8a019451cfa4f63345a1f2051856308285689837a65e7ab1e25d
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 10760 bytes
SHA-256: 9c3866bebf2d6a89a9b2a5721540c4334887fc368ac7657e405d092888cc75d6

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