Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a3781d05511390…

MALICIOUS

PDF

95.9 KB Created: 2021-07-24 04:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0c36eb7b2c94f232679f8e06010009a SHA-1: f777b33f4cc32cfe6c593cc7fc6844b7b069fe18 SHA-256: e4a3781d055113909cb03fc7e84335047eba07f930fc985d5b15316b70d3d80c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure and embedded links suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://minhanh.com/files/bediwofubipudowotexas.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5c226a6b24da00d320e5889e63e2741a/48607842281.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/17696410969.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4fdf9925a575b6c9d1b64ec638eb239c/jugoxoxarilig.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfec4e86c2---reruzadurojeriw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/87717414596e11bd648686285db3b83d/dagunibikutulu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8mdmi86m7o0u8jqk8i8hbv91f5/78634875346.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b46ad380---33840904951.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/28812826279.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/4938007554.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1860ec35b5---66476898626.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/23592653216.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/93533662508.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc9af20fe---46972175608.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/78982607790.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a788ae451c3---nizuxalarurunalob.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/duwuw.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/95463644113.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a895cb55dac---30914036876.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e205841---62491942536.pdfIn PDF document text
    • http://talleresjpg.es/img/file/gonemopirifewonigiruwu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/47fb5379d92b43c98337f228e096b682/nelikano.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210620095709.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/5e8fe0d769dba1b2394269063d06d273/zusigexuxepofibuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+many+calories+in+a+burger+king+breakfast+burrito+jrPDF 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_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 18120 bytes
SHA-256: 0fc315b8aff333535c02b350170a0146abda8bb6b440d97c744416ee2a7baf62
font_01_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15686 11332 bytes
SHA-256: d00f5c97f3625af4dd63892f0feb9d7ca24915ce5fc9639e6bd06f30df5f5e31

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