Malicious PDF — malware analysis report

Static analysis result for SHA-256 8855b69efff2e10b…

MALICIOUS

PDF

83.1 KB Created: 2021-07-19 01:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f77b08cddbe083434a2f2a4704609a66 SHA-1: 076214836a99ae2887e2c608a2454e635fbea960 SHA-256: 8855b69efff2e10bbfdcf591a6d671943ce56520bf1e36b63b1452246264cbe0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://amitadevnani.com/userfiles/file/13839444672.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7098e8b1e0dbf4c48bcc4e195c110ca0/5167361948.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/be07559fc5fb8b36e3efa57775c0a537/jukefisedabejasotipis.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/85662437642.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/42f14fa83eb9122c9cf0ce979fe384a5/domadaw.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/97761507064.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/17f856ea00025dd27f8645fa65cc8f1f/letewumeso.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/88358794469.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/3018076394.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/28134999855.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/85430052870.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160819638b34ec---25656358377.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9270ea7ed---91969963981.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4798610cf---85876547054.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zudorolujovuxizodogo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/194f5eaba9b062bf75bdfaec59a02343/besifewitunefolugufilup.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/892rdvb1h89v47k8ee12otup69/vaxelokovixevafikenu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61985120729.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/84275630322.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f59c2e259---50982901790.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440beda3dc---53739193993.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021713425209315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ampiclox+dosage+for+gonorrheaPDF 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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 11052 bytes
SHA-256: a8fdec3a47dc39c8ceaf39875c428193d8cc9b4a577270c5c1a008a824a265f9
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 17056 bytes
SHA-256: 760714589e07cf5a12db6480b58ad9b448caa69ac7da77656f42338fba78a573

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