Malicious PDF — malware analysis report

Static analysis result for SHA-256 274ae4bb655ea3ce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 23:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 644f15ab8bdc7af5e11b841eb4533c99 SHA-1: ff5cb2bfe9864e9590cc6c3c931874a98e24b14c SHA-256: 274ae4bb655ea3ced78e2585fde3320f9d1d4fdb2d5971b83ec392f44d23194e
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised websites, including those hosted on disposable domains and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=platinum+stair+lift+installation+manual PDF link annotation
    • http://sity-luxe.ru/userfiles/file/xiwige.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/dujurokupogejugobefuvivo.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/bejimetev.pdfIn PDF document text
    • http://erex.hu/upload/file/31991296743.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/82405029699.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8f89341---95626640347.pdfIn PDF document text
    • http://placc.info/up_image/fusiwabadeb.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58b57eb1f---49865509282.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/pewozomixusedol.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/016310f73fb59dab6d15b62a5ef6021c/66506841352.pdfIn PDF document text
    • http://gugugroup.com/userfiles/bakope.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/23297608513.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/lidirozenemagisifi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18d2db20d---jogitifikan.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/ketodoxulodemelebobi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/84591885122.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/15aada854e9e5841ac2eca7f417d60f5/7185863032.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fiwafovijijedasu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b36eda5a70e---mibosoke.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/80680601725.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/96647504129.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607576ce2f0b5---pipokixerifav.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915bca3d361---vidovitutunusazabijune.pdfIn PDF document text
    • 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_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 17700 bytes
SHA-256: 136480abf6f0eb38097657d29f72ced3d1a072d2319d9ba8f15ae336d735304f
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10344 bytes
SHA-256: 36e77ef416c8376c4c788b3aa7a9dbb28ece6ae6d5537c4f62bd9745bed016f2
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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