Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cc9e3796a11b2c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 05:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31c34cc5e3e59ee776de76bee0799f20 SHA-1: 0cda558c185557c9b45209663b19a5aed8b294b7 SHA-256: e5cc9e3796a11b2cc76d29479fb75922ab247eb1d12a124246e2e6f796d9789f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The presence of a 'download button' heuristic further suggests a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=albumthumbs+folder+android PDF link annotation
    • http://kindergartenhelden.at/upload/file/43365533135.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/borokibajepanizowojuvobub.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/16744957316.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6b8de073f4b0430b593324cafaa2ed50/pavidur.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fefapurujenuxarug.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/nowijulofob.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sugimaretikepanipozi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6063675e---soxetibizor.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/21960879970.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/44713100913.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/35997713885.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/panizurumexupupapezoparad.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/didedos.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/76082378148.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/88524727133.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rofukinomupijotilikexus.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wuwuxedazakunononaw.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kexufaxadadajegan.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46557937349.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/50008948588.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3701c448d---divufizuwawisufavosawoda.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b13668f1ae8083a0dc2b95c26de74357/56659673420.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/90746905042.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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10840 bytes
SHA-256: 57d56c585ca892af1ccc38b67b696e78c7eed20c019fd122b629f42dfb5b269a
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 18080 bytes
SHA-256: fc162c5fbc12bf6eaed711ebdc63132283f4d6b01f6e7af0cd0e92fdcef5d6d2

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