Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a757ded6cfc137…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 20:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27b37dec6887180a619d952efee1a101 SHA-1: ed71deb5af1eceafc002a5c277048f77b05be593 SHA-256: 32a757ded6cfc13773c4bd4292e6a37b3912481a911fa9882f0cd990de97c963
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, suggests the document is designed to redirect users to malicious sites or download additional payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://1utilaje.ro/mm/file/gedelerokakudopufer.pdf In PDF document text
    • http://volkshilfe-ktn.at/images/content/files/61244839891.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3716ec21f---mexoxidovewotiguwitavaput.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/zevutowufirid.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33491845485.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c02f0d193e866df6e357f5b42aa9ca59/nebanaveke.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/24433971396.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/napevisovenubuj.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xafazizak.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175087ab6c---giwuvabuzumobikexerexe.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/gagixinajakof.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/73556532807.pdfIn PDF document text
    • http://chromoink.com/updates/file/35670259713.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614040914f3ca---74285377582.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/sifoforesug.pdfIn PDF document text
    • http://artediapharma.com/upload/files/82533098072.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/pinenevojadozokiwek.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1584493329.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/53658c640c4556ee61b72f0f4022740c/guwore.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/6073964868.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/ponapupagaluneferigefela.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161359ecfb2b6c---sepedefibime.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/gonowaz.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/25522634473.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/25170995281.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/11600034001.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/64b64bd2533e0d7fbc9ae485f75168d4/pagifapogunozamutinuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+rgb+to+hex+onlinePDF 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_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 10396 bytes
SHA-256: fdfbc71737a362f0839667438bce741f2b81251b8a82cce32a874491e55c6e17
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 17696 bytes
SHA-256: d9c1c3ac10890800f7666e0d9ed33d1ba52a11fe48f564efd08259163ec879d5

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