Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae6ad5660209b04…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5797cc627367fbf941fd1defa634e72 SHA-1: 78daf0204856bc5ff5c810acdf3bce2591a8b9a5 SHA-256: eae6ad5660209b04b893ab1b545f49b7d46bc1a7270a7e751df12fc923c40cfa
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using documents as redirection vehicles.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=android+developer+jobs+in+navi+mumbai PDF link annotation
    • http://bighost.vn/uploads/userfiles/file/42883115685.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sufok.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cab3375d---duliga.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/o5adbj3bf0h5nbarjuvg009np2/76275270678.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/41613368416.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/madenosuwakuxafin.pdfIn PDF document text
    • http://vizcsap.hu/files/file/53079928824.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/271130579343.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142973308dfb---84670999167.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/padawerikixaw.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/48082504571.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/77591087443.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/zenav.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3cb120c0ac376467e70fcc5a71237a0c/kevoletapijezekuk.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f11139ca1---54553047011.pdfIn PDF document text
    • http://popmetre.com/news/files/35603114638.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wuvapoxijemo.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/42733509114.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/32168536372.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/timiwugizolir.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/vizuxomafatim.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19311928810.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/16756051265.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021917849231346.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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 10872 bytes
SHA-256: 006bf623b2f70372039b54ee7c846bc2dfa6bd32562ae5e386998646ee9f1710
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16612 bytes
SHA-256: 31499d0b067f031dcce91c216c32c11e96c47cbc7a886e0ba2c7374e2be173f7

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