Malicious PDF — malware analysis report

Static analysis result for SHA-256 007fae48294ecb98…

MALICIOUS

PDF

90.3 KB Created: 2021-07-24 03:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 4dd92d5656ddc5dcb3a96829eb3a45ee SHA-1: 769d7600a63f8bac26d3bf82091e0cbd71f8e177 SHA-256: 007fae48294ecb98c0d1f067e6125fc98f168e1eb0bc3893c16b90a4b28ce3df
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1110de335---guwusutokusososezuf.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e672945c564---fijilijasukemaremu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/416b33a7821162e61b2b9fc8b2efbdc7/94986161637.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jear92rnqaj3auvqs29fgjm82t/rijumodafobolewebuk.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc8b4f2f1---dorovenikirilubixe.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kumobuv.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/34345140761.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8031b7645e46a40066c7db6a6613cd04/65306524487.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fb21d565de4943960ff11c084b4f958f/tapisiripurefolobosidi.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/napava.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a95ee842f13---81608007713.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add65d3a7b4---xigikaxeforuvusiguf.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mosamixedoforekulufegumab.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/ditutizuzifenovewijud.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fe166174c00896009270a6c569bc4336/51218682653.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944804bddbd---xaxatefomofarezegoworono.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/baratoxoxojazajiximoteg.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/berako.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/fuwiwedudeteji.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vidusigawefim.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gozipo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/82672236886.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/23915293228.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/326470eb0b9ffbcc394e368419c55c0c/nixikokoga.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/luverev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=avast+cleanup+premium+key+2021PDF 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_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 11060 bytes
SHA-256: d5925bd8ddb8ce56d7a7dfe6a1a014e751babb9217fdf001a3a99bbdd9ab4b9a
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 17584 bytes
SHA-256: 0417f8d7cb4099fb6aadb027f340894c3eeb2a78a27bb27fa4f21405e6b49ddc

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