Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1fc2ce83170ff5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 21:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c28f3f09ac2d7551ccfefa2b750bdb07 SHA-1: 2abf3894573dd3459dc730bc6115998f34488dcd SHA-256: de1fc2ce83170ff5e3e83ed12c936c663f091f2a8d9bc8388146ccb2fa9c81ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple unknown URLs, some hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vulelejiriwuteradapebope.pdf In PDF document text
    • https://aimara-bg.com/userfiles/file/nerot.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/66225784435.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/25476871077.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vuduwopevekuzalojavurig.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/49652564299.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/latupi.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/wabuxijawatelosituralig.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/derumizokulozo.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gagobez.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/37830344999.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/56807587713.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/33344154286.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/2403493682.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/gotofizuzazipemul.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d9197cf98ab65a2fd7d78e818c5b5310/mugirep.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1144e1a17cb0f4f54d3ab9aa531e9144/42166254190.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/12983028081.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16135763b41461---1807761856.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/rasameziv.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/81472479334.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/62503682483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adding+s+to+verbs+worksheetPDF 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_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 18260 bytes
SHA-256: 742967d8fc1eaf10b9b61873f8fc65837253bc035b8e7ee6712ee3f8b95119ce
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 10684 bytes
SHA-256: 27a19c11e1a2ce9bf46ca84dd2dd82e8b35f6f5203d1aa19d7aed2529fa793c7

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