Malicious PDF — malware analysis report

Static analysis result for SHA-256 c957aebc7ebf46bf…

MALICIOUS

PDF

90.9 KB Created: 2021-08-05 00:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fa663ef3bf681d109bf02ba0bfb8fe9 SHA-1: e161fe0d1b0e849fd364c70f93af2debd034b3f3 SHA-256: c957aebc7ebf46bf1f158427e933d1e918202b82b56ea6f199ff31edb79f5f70
224 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of heuristics related to security bypass and a download button lure suggests a phishing or social engineering attack. The embedded URLs, particularly the IP literal and compromised CMS upload link, are suspicious and likely serve as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://157.230.241.115/image/upload/File/gufisixop.pdf PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3a089e76---gisulolajefojadusera.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/dcc9bcc8b92d9d9f17c239585e0e3afa/94243789036.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f72a1f646---91057522518.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ef21b673ac---sebulujefavawen.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/vukozetodusozida.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/65045993831.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/tazalanoxu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/91119013046.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c6987aa6---xuxuvisokegokanozene.pdfIn PDF document text
    • http://crediramasrl.it/public/file/nudazigibisanojujikokako.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca915e1ce0---32528654456.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975e5cf6d1---jaremogutikiku.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609273772b4dc---manatalujavirerit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1321e43023---7710465329.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b014cfc9---refisalufidajozuvanekad.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514130341158597.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/96583339651.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607953b53c837---fimurerujaruwefelobijajig.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kubewan.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/73031258813.pdfIn PDF document text
    • http://labsshop.com/d/files/30744474027.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/teruvolirawa.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d48600ee9483f1f35e288e0cc5681067/34277812779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+minecraft+java+edition+for+free+with+multiplayerPDF 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_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 18116 bytes
SHA-256: 939ab843b5cd650c4ca84ae7b9dff779b07f53b5686a17a6027f95f99939c06a
font_01_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 11204 bytes
SHA-256: 958c5ebfd16c22ef8708e875900abed37b63a1c6f7e84140fab352310c08850b

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