Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c07c3140d8291d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 11:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a810038611123ac6bb596abd168bb544 SHA-1: 24e312639cfc2ad4c5170cf3c14e26ce4f00a3c2 SHA-256: 83c07c3140d8291d5d1ea30c00aab9ec166700b9a7635120c31d768499e427c7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20864dea71---71990247439.pdf In PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/labebakupidorotorinusup.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zukoxofusevefesejofesimo.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/filujogakigun.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bebbdcb14370e81456213964f3c61eea/zafukepaxevifixivuzope.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eb3ac41cf---xaxeritiropanoj.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b339d5125---digivuwirojodimugulobo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/afa5b9ef60801a957d59665dca03b39b/47414152187.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/jogaj.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/20518313127.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/24196861757.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7pl80gf9dro2rvlhf85f105peu/6899445358.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820b6b70659---88716058777.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/18031281533.pdfIn PDF document text
    • http://talleresjpg.es/img/file/xovelekorutazebodotiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c98ff---pinapozazoja.pdfIn PDF document text
    • http://poorclarescork.ie/images/66636111097.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/2292261181.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d00a90c30---82938556512.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/bafuvirekerazil.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/057125326be9c29b37e664545b3cd4be/72026123355.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097148572b66---64720289340.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7aad7731---41882798610.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/dodebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=plus+one+botany+chaptersPDF 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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 17084 bytes
SHA-256: fb08be09c30b5356a277c5e7c502cd1b06dcd217203d0da70b3e86384340bb95
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 10732 bytes
SHA-256: 2c5d83560667cf9bbe6589669d2deab655fba885e7a8d4e8714c07313a23cca6
font_02_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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