Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea43876f3838e04…

MALICIOUS

PDF

74.5 KB Created: 2021-07-10 03:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e67cf6af7aeb7d9903daa63ebe3cad1f SHA-1: a87b8e79308a1d76c1c7333b97a17375e46868b1 SHA-256: 1ea43876f3838e04a2743a29f1a1943550bd5349baca510a385c98a8deb151ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farms pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=channing+tatum+meaning
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/be406077fc6889e59f665e99eeb2664e/karijap.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/37293026309.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9qhpl2qp7obuqhc5d08eock2c2/34795889220.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f3e36ec531cccdf4474a9cfabf513d1a/nuwujeloluzibesexivab.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/51573800704.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc314ce888d---4716931381.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a277fdca---2068639723.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/of7fh1qqi3ldj2n8o4si2vs9k1/dezejuzojatoge.pdf
    • http://taiwan-casters.com/userfiles/file/kuwofonedurumosixunogev.pdf
    • http://amandatravel.com/userfiles/file/jonarematiw.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/sifisetefibuzowene.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aedd4b423---zewezukerusaruzipofox.pdf
    • http://constantemails.com/userfiles/file/162462637172154564903.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/32d395c5c3d7a1a6dbbd7060ad274533/29798224987.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d0f3a509b8d1c2d8285bafea06252117/31464548810.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/2884637570.pdf
    • https://xlspandoek.nl/userfiles/file/81359451090.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160872dfa85bf2---jakesewugodapova.pdf
    • http://cesishotel.lv/res/wysiwyg/file/difarixujarituzadob.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/503a662b19ead514c1f401cd317d3d59/11845755957.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4c5a4d78---rubiv.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd8ad3d7a---kanefigosupisijonidukuku.pdf
    • http://normel.org/files/upload/file/12825404585.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 16792 bytes
font_01_sfnt_off0000d9dc.bin
46a13fd58b71fdba30be101f27b38352d4111ddba0780eeb70b1c5ae0266768a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10252 bytes
font_02_sfnt_off0000f0b4.bin
12605e4cda3a67c1dccb2ab040f6e80ec314f32bad8cdbde260f4243fca2a94d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16884 bytes