Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a0fd7d4db513f7…

MALICIOUS

PDF

90.3 KB Created: 2021-09-11 09:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fbf34071ca538d255564b45e3483510 SHA-1: 878a5266de8e08610577153dcecb715cdee29bbb SHA-256: 89a0fd7d4db513f73f266cae61bd525d7257017b681c1506c6b5cbc463ec2b6b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and heuristic firings suggest it's designed to lure users into clicking these links, potentially leading to exploit delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9c217481c6ea812d8b4832287051f9c/63092925089.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h7ge9orhibe3um4stc3opf824a/19871278084.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/90954665707.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/feo3e6vi7cbkproeidf9a90o70/zijogoxuvofofo.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/25976000967.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/dopuwufilaterebafe.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/sujisaluvubi.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/bunovefesikidasefi.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/8601990179.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/falurifulutewepaxarapoxo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6d2nmghq9qad7g02ii8bh2etb/tivaxuramapuzisij.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/pusibiwojaviteju.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pplmha5ercir8980vtjj85806/wuxutovowevosok.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/56863161029.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zadijamudivefug.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/siviwazowugelix.pdfIn PDF document text
    • http://koala-al.com/d/files/dadabatokararifagebawiw.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb00e6844---maxomafopemikizi.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/rotidezipexulopaxugejosox.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/32062419488.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/43078419847.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137398a599cb---78492308857.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050201505642.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/14869057500.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/misagowovufupizuzudes.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/64404493075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=game+apk+obbPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10076 bytes
SHA-256: 6f0c88b5a0619ce1361350ddfba63897bfe62860063d8b1953894c46933d84cc
font_04_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 23832 bytes
SHA-256: 40edcd6a7b916c0ea0763d102d59b31f98c108fb243cb1f24fd0e6ca1005437f

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