Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf5abbe9e011b34…

MALICIOUS

PDF

82.1 KB Created: 2021-07-24 10:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e226db8ab8c7923f6f8fade3e4a3fd95 SHA-1: a9d5efbce3b44348e9a3dfd817be5eb8868043b2 SHA-256: ecf5abbe9e011b34501be014e622a8401f754dc32a2e66a06f1531620f5ae97a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PRC/3D content and duplicate object bodies are common PDF obfuscation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://adance0112.com/upfile/editor/file/51761012425.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9db4a5d1b9---78430756828.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/1486483127.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/619cu6a3mm8i1bofn119rikdo0/88747209374.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/976cc7e81c62b48ddcfca209f050336e/23347260878.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/07991fab2a771d2bfa1604b7ff7fd73a/mikasogawupeguguk.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa302f8ed2e---xiduraxubivinatamemog.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/rigipeperofoputeb.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mhq6kai8kmic6l2t0caljqprfd/lazasabugivuzi.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/16339108518.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a497d4e2d6a---3628654454.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6dba4f3a---dipexazopagezarusavow.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/tirux.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/3749687560.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/megez.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a387026f389---5172868672.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3a2e6984af6f3e5222aa4612080e030e/nuxiboluxarajadubuxitado.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/81174478261.pdfIn PDF document text
    • http://deauville.ru/files/file/golafavuvuburan.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160956ff41cc20---labaliwivojesatotakowi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d23fcf80a---2653040991.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/31fff610dc037cfe7e3f9f5cf6fbca9d/31523627096.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/db4d41d871b92f60d5ef9feabb6dab97/54360190878.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7959ed18a---letobeminodarok.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/63214657231.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5ab8370c494999d7a15c970415464db3/18058930165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=daru+badnam+kardi+mp3+song+dj+free+downloadmingPDF 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 11464 bytes
SHA-256: 39e9c84fb787d079d25e987a17ce0948786e85f62ec9818e8a8ec09b8854c46d
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 17452 bytes
SHA-256: 89f46bba7d7c88dc396c26e44dc2587249ceee7d7471612ed81ff06bbdba08dd