Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d1717cd8c95a1e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 11:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b6b129fbfea6f6cb43875016a43ad29 SHA-1: 8997d023ae0bbce4db2fd3f0ffd92e3cd70bbeb4 SHA-256: 36d1717cd8c95a1ed6f38ef5b128372c13c04ffa59c6dfe2e613ec31b90d9083
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malware or phish users. The PDF structure itself is also noted for containing duplicate objects, which can sometimes be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amursvoidom.ru/media/files/22019755404.pdf In PDF document text
    • https://glory-aqua.com/userfiles/file/mejezidepevopolofedativo.pdfIn PDF document text
    • https://terracell.info/images/file/lisemagikewoxoxup.pdfIn PDF document text
    • http://fotossc.pl/_files/file/73886743656.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/tegapumesusojerubipifadav.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b7aec28322a802c9de332ffe5f20ef63/47523199456.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4796ba081---ximodululujabawumal.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785f419141a---wixusigi.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/51180187323.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/loroxilitimelu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7c45992f1ae716e4dfe22415ee0b6b74/82300285556.pdfIn PDF document text
    • https://etimes.mn/uploads/files/davoxo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ae36cb645474cf2947cac4b02b709a16/8533161399.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/fekisu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8f3aafa744b1f4c39006df4cb511c817/41829118888.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/ledodono.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nv32kgdf3i3skbpeoiqc40guej/36166443080.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/gekovapiwixunesorada.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/37952855523.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/o9fi2ch88g2gqd83fs75emdaq3/5532975422.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/zeguzereparulolimal.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/lawit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=skoda+fabia+2004+manualPDF 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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10744 bytes
SHA-256: fda0fcecad3ed3cebe39ada6e32bb61ad7a829078c2e2383d557297712523a03
font_02_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 18360 bytes
SHA-256: e51d519675379628991a7b8e6b30bff6601385ccda334fb89702b209fc55c473

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