Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c63cff7453276aa…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6bca50f25e7eff425dd4dd7b35970804 SHA-1: a7fdbcc934fa933c375983ef94ef84b8cfc158ba SHA-256: 6c63cff7453276aaef8ceda3dd070b30dd6d56d652de4a448a7a4866e4eb0020
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=12th+physics+book+pdf+in+gujarati PDF link annotation
    • http://lightofislamonair.org/uploads/files/momuvomitol.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/xenotejimekofulekamirow.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/19158056792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236603a71b---46894535437.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca3055a6a---17230199989.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1f233605521c256ca2ea0bb3ce329f0c/48121559954.pdfIn PDF document text
    • http://vit-physio.de/file/10976142223.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/javavub.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rinowi.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/59116643693.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40241b5a5a---65159520080.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061805015473499.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e46351e9---93594649380.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/09f1a4f7f86321ab9378621fe8ef7ce9/biwewiliraket.pdfIn PDF document text
    • https://infotechbg.eu/file/71668964183.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/kuxakomozabuwadole.pdfIn PDF document text
    • http://checopharma.com/upload/files/53127641483.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/24696061024.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fb7a7e695f9e558b7604f7045d52dc0a/31814515893.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/97170001023.pdfIn PDF document text
    • https://ags-car.com/upload/files/zuligegamozevoka.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/8232933289.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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 21708 bytes
SHA-256: 835984688a032ab69f4ecc6274f08eab81734702b40f10f55721d70dbe466e15
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 11372 bytes
SHA-256: fb2f3a716d978e840f8653d2a2290157b06b2c4c49ac2c1b61a2590aa699f1d2

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