Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1edcb09ed257965…

MALICIOUS

PDF

85.2 KB Created: 2021-08-17 16:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4be30f83dacffea6f7948aa6db8fde1e SHA-1: 770593f05de7f4fed5b2bdd8f86a68c7a182eb20 SHA-256: f1edcb09ed257965f95c702ad002c516736ba3195df5cb8d657c3567fc284129
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1bdld0efue4qq4bt77l2gavlof/zunopaxogifuz.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115e45858c82---93098618140.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d4801ea3e883a37e7a071f57ffe6e193/solimepe.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/vunelabimilulinejaju.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/liopuei1uo49vlchc125h702ul/luvuxekosifukal.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/wefefiwopusif.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d6e86894---88657653561.pdfIn PDF document text
    • https://magatek.com/documents/file/novogolawaburizugirowoguw.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/40385950437.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/lokage.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/abee80c058dbeb1d6a26ebc1a10a0506/42307727681.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/vebebomodopuriviri.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/daxexaluferafuz.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/3563597153.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e6e4818ce8880d4f753f1c02087fa730/xegowinilu.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/11383462132.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/32495485965.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/63ama6djb8tsopbt7oh4crc75m/37654572608.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cv39aem4pi592utnmvjmeclclp/22237348564.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kutojapuxel.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nugavoper.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6d39abd7d966bb169dd89c03019d9bb/penanuvamivowa.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/54778058315.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/kuxixanigalinebebavuzes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+easy+recovery+essentials+windows+7PDF 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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 10680 bytes
SHA-256: 8d89c12db3ed174ffe7af8b0faa6f951a64a721b3b9bf50f59862fd630aa77d1
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16296 bytes
SHA-256: 1930d950d79dc27101d63dea3b879c3c6d7b080e5879f0bd4aec1083a3e16bbe
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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