Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f04df6fd80b040…

MALICIOUS

PDF

194.4 KB Created: 2021-06-29 01:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3572199481ec27382d8d782d778522c SHA-1: 2293ec0c63c97f60c11ba8839a8af0e0a8307ef8 SHA-256: b4f04df6fd80b040a29606dfd9baac30b8862b87463d6e7e0d166c58c3a542f7
264 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV. The heuristics indicate it functions as a link farm and a lure for password or secret recovery, suggesting a phishing or credential harvesting attempt. Several URLs extracted from the document point to potentially compromised WordPress sites or disposable hosting, likely serving as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0a79971ee997bfe28dc616dbaea4ceb5/9300976774.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/munoxaxaradevuro.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/96120619189.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea3e4066e---tesutevabasajarude.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/fosasopigid.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ofuujchkkb4tl7nqftpc8uv04a/35474636865.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705959a230---98678664162.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/14428067852.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/40377278321.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/511881a626de93efaf5eed62b73d6f75/zofawoz.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/dubedusitubosenekoj.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/divag.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dawogerogalipisibis.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/v71r9957kdded6primk6ui0pvg/80467506354.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/28d9166a56739a6079aa52c7082c2fe8/62384535535.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/suzowajoxulomibot.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0536452---wakefedonogowuzavavefad.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9ad8bbb1b9c38c2e2a8d72e523a3cdc7/dapiwimipipemaw.pdfIn PDF document text
    • http://sowitech.vn/upload/files/janulavipafitafijeji.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727e879ca53---lojatumexetenixuwezuvo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcdb0eb7a8---41498705541.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sibodemulevifusikitidi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/nizigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tonya+gregory+from+steviePDF 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_off00029887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B09E 10656 bytes
SHA-256: 8c68a201ee9bf334e517f6e3ba57ef8010d63debedc04a1f5919811b21d94638
font_02_sfnt_off0002c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C91B 19556 bytes
SHA-256: 108b96373592dc9653d3e8aa3f06191a7611e7c094c9e6adf4a02f3ebb752e70