Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e04dc66a27cb80b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 514eb799154defbbf23e9d43ff54d94d SHA-1: fb51d333ad59697aca4d80c4dbc842fe0d022249 SHA-256: 8e04dc66a27cb80b70da810310a3d4c3c8a907c0442578a1ac180d45a24ecef8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://f27szerviz.hu/upload/files/xowanojumadenosuranenon.pdf In PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dfa0883467dfca03cc4e1097ba16cf6d/gajiwimizatolifabodokik.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a5c9dd10bc955970e6d1422fc8289182/towusenoritusob.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/2008232132.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c96632b547b871989d1d7f64150dc946/demivijoremagexuwu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7bb38758a164b75daab9ce651891b4f5/bemamapa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2fc6eec7bc57d8460dd099f5020f6b4d/kalizoxujazenozig.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zegovesokubed.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/pogedipuxarevo.pdfIn PDF document text
    • http://esejsc.com/upload/files/xegavejo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689b09ef7f---pimunomuzuxabubuvixef.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/38279331094.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/rapukovos.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/pawotowaxusuzudofofula.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2e31069bf2aea77d8964ebc55fd61ea9/nuzisumemomuwug.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/dowewopuzudarij.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/89734851402.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c69cae194d29e91cd8c08bdc1635a300/2228734645.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219504349837.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/bituxomipawa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104ccb7425dc---33799581494.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/78039153693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+happens+when+you+have+a+miscarriage+at+7+weeksPDF 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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 11276 bytes
SHA-256: e62cfa7061166a572b9f37352d00d6357f4c6c2482d0b637b9a1aa9d2a211105
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16140 bytes
SHA-256: 19668a2ca6355c23ce1cdb6049b530e8c4ccaaae7c1064d8796828ba73a86a71

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