Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ae24ad2b89fa1c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 22:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f3b8d978ca889a96a705a4a3fd827e6 SHA-1: 6446214dceafd144cc84383a3c8cfeef44fce042 SHA-256: 70ae24ad2b89fa1ca6989a45da4240837a94deda28006fae30e1330e77f7c852
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=customers+types+pdf PDF link annotation
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/14813691542.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607159e0e542c---nikoji.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d8db4f9b---rosofiduwil.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d194da585c---97077546021.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e70862d4df3ab6f242d7742cf0535cf7/93232727288.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/risivutedebonewafa.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/14771379517.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a221fc3ec0---difuk.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/21282323700.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/80620706630fe7ef56092bcdbc24d553/78560830104.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/69850603174.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/79727303811.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/41b43c52a288124a56e050de5cf473c3/421364816.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160effa8897133---gogofadaz.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kolisopodebenisudaturiru.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/satamanilodoferelogidumux.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/b66dsjl4jqnrbbepi3tsuomhgv/mijibanubugifofe.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12876244044.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vawozefu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8c73107---nedutafupakefolon.pdfIn PDF document text
    • http://arslanemlak.come/file/lewufojemovo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8f8ab131---potij.pdfIn PDF document text
    • 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 10500 bytes
SHA-256: 6ad6c250fa77d402b7f09715fcbdcef7921c75da43d38f1058d14def97d126ab
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 17640 bytes
SHA-256: b20b5e9ac49331c7092eca0221526a23907323aa0d1bd749b4350a70e8d5fe1e
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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