Malicious PDF — malware analysis report

Static analysis result for SHA-256 624a8dc143c6cfea…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 05:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b784cd471826c0fc1a72cebf45d9b52 SHA-1: dae904e76143876f1c4be56658ff4fd12f58749d SHA-256: 624a8dc143c6cfeacca1ca1f85698668af03c2da9d64f0deae57e9b6cfecb588
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised or disposable domains, suggesting an attempt to trick users into downloading further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a download button lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://damnoen.com/ckfinder/pho/files/ribonuforuxe.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/58134447592.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/pagutagopisafivuwasugo.pdfIn PDF document text
    • https://ratosatu.com/contents/files/zitupexawa.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/nugijizura.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/23458506325.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/20642720920.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ih5mke6kv9a9le6nqfn02mcf4/kajav.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a365074---bavedumadutukojaz.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/60679892387.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/sowofowekemiboda.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/buvipimevunisojetevof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613575dc90382---11061192488.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/julite.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/47993108201.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/siwedimi.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/sexabosokosanesarenuk.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/70595936140.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/vopefe.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/22108270434.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/molaruwipukew.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/mixew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+latest+adb+driversPDF 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_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 10536 bytes
SHA-256: 1c336b59055a6cb70c0c944ce607eef3b9adc96c5fae628eb99e3bc35260baf5
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 17624 bytes
SHA-256: 2ba8b240b571b0e537634da3985e8a39fc108d1ce0f5979ad3b2404189f3f1b1

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