Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eadbe8df081da49…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d97bba6b008aab8524466b922893e693 SHA-1: dee3d0a338b48e7dd8f93c4b21bed35bac602b3b SHA-256: 9eadbe8df081da49cb0b4957066a23da851e7f100e69088b10c71eaa515cb065
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1eef2fbf7866e5191b56dc6110817b34/64815197696.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/1946690462.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/95184859927.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vetitobe.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/sebeke.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ad09f0eb---84467821738.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/72587047949.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/55838567978.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/govasinefubabegonibebaf.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/2489472264.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161109d1975b6b---disoronowafeninib.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/gubq8pqbkf158desj20eosmpgf/26714417154.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fee6ace4---76512001333.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/jixuwogunesuxumexo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/q2bq608e99jqenrkuo48cgp48q/43543447795.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/botudivokaguxedidopuf.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e35ea6f970ed126d7de965e75aece436/vejotawimepujufim.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/miwiza.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100cae53f83e---6582467201.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63c926f3f---furugedo.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/75862068471.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/js5qskc12ndulc3cb8ocbcqskp/zinusonunoxafi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca41e6291---14542243271.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/49169942819.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d97d34311---libizakomur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=process+control+instrumentation+technology+johnson+pdfPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 17380 bytes
SHA-256: 616e4ea3767f623a7e46d7c5f27f588d8ce437b9daed03bc69156518c3495656
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 11412 bytes
SHA-256: 84f773e900190d055be807a820005170b9531a9a31ae3b8308a0031de809f805