Malicious PDF — malware analysis report

Static analysis result for SHA-256 673fd6d731797fe8…

MALICIOUS

PDF

91.2 KB Created: 2021-07-19 15:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8627c76e7d6913e5eb2a5891cb7ba184 SHA-1: 0d642122cb150123bc61024d03108cd94c6d1c70 SHA-256: 673fd6d731797fe8f5f41d39832bc110cf7acf7732b75799cca8cbe6d0540f9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/68f297552a5f289d8e66c18b733393ec/51717205700.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2b951e0f---kifulamodavofilolaripebi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/25eacd908c2ea4771a469092b7f32599/vukewunejatalopu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rsgt7sn1tul7j5m076dtsl9oq3/riwabumuputefigo.pdfIn PDF document text
    • http://africareview.in/userfiles/file/rojofo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//14666326721.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d563d9918957b35052f74502f8175b6e/46005178095.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/90392020199.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210612171319.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/86614156421.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1786355d5---sumuferi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34429e763---50954704383.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/69864449905.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/82286346239.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/13fsbpehjvt27c25nnjeglqrfk/mizulekobefavep.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oqk2dnjp6cbon1o86m0lojtvke/wimewofetuzazikonegebagi.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/758a7r1on0q0qb5hges8s7fhvu/fetufa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ik3qcuj0roj60tjqtj655f70ap/28296870595.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9h5lqms2p42rmvdh6j387kqf52/sagovofovanolezexo.pdfIn PDF document text
    • http://nfc.soo.jp/file/64552790253.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/49adb5faf896eef2f6e8a09efee2085f/82017529580.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c832c265da---leduk.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc62eb61f1---sasurewobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quadrilateral+types+and+its+propertiesPDF 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_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 18764 bytes
SHA-256: d49987fbc5053f7ba374d903b9b7b9d90a9eb83300cc0ebc6542e45f0e3ccc75
font_01_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D3 10660 bytes
SHA-256: 6261f27eba8ac4c95c5e3f271e505d960ae3a4a423f979012afb2f0938d7067a

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