Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad64db66ec90102…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 07:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 479cf0c9e742a7f28871fe16c668af43 SHA-1: 2921f02fd723574b376b28f02207823dbd7d6365 SHA-256: aad64db66ec90102a12169fd408318c1f23191e4c8d5568e97419b7e59638f75
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be to redirect users to potentially malicious or phishing content, leveraging SEO techniques to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gutachterbewertung.de/userfiles/file/52075559021.pdf In PDF document text
    • http://uniqueaddress.in/crm/files/43197161556.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/volitidibos.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/20550313219.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/12fdf970ff02b5e7c75a5a681027327c/82534623208.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c31ecacb---48755721504.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c55d2a0c6dc63ae8fa1ac9acb84bbf4d/notarakexeleg.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabbc63ffd---gopojomerawo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/93610341531.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/54673347207.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/pelufenot.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d185567fe573089dc899db528d2afe00/zojabifimotirog.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/34568280598.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1e69dfa1---73548799607.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6ffbdfd4cabf53acc0a5a12444baeac4/35258723300.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c05c26f7a7---xofenodujido.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/25959584175.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/92755440183.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fe166174c00896009270a6c569bc4336/51218682653.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125daccacc1c---39827721423.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/34692248362.pdfIn PDF document text
    • https://aneri12.cz/res/file/39378327681.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/87989894964.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/41ff8am2u56g8g8j7k1nrebbtp/jafigekogidasamikutidape.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160800def439b3---97362663351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=renal+tubular+acidosis+pdfPDF 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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 10900 bytes
SHA-256: 99f5e527e94a078229da3818efbf33adfb6f6b76fd85dd82ec467a3a941bedb3
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16956 bytes
SHA-256: 45ff8a6b1881f968950f98d11ecdf6a48f70f8d0aa8070775d8ad123c9f3f667

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