Malicious PDF — malware analysis report

Static analysis result for SHA-256 c632641e0be76ba0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 11:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df2fa9d5d63b4c2b9449119bf93e96f8 SHA-1: 7368e249b798ca87a8988f64f024b4122c2645aa SHA-256: c632641e0be76ba07df1f97c54c5299056dcaac3568ad5c78ccd1c948c441887
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=google+pacman+hacked PDF link annotation
    • http://nuovojob.com/userfiles/files/xegesulupajaxiloxevupikol.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/86607621365.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/1788517143.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090615163373499.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050218112031.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_26_50_7817.pdfIn PDF document text
    • http://dd-eng.com/files/files/setuwozopen.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/22372601553.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/zewev.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/zotejawaregi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/491531556d741106e546d802e2c47a8f/56691012527.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zixebowujizasipa.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/74043788682.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138911d067ec---voral.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/18368835819.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133342ba1eac---gipixekotusalolafigis.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/22412449351.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/dokupizasuxegibakefasufim.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bigilosipegeg.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/6562189202.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/jolan.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dufof.pdfIn PDF document text
    • http://brlairport.com/images/file/gilonaxifekagevijepekise.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/xebelokovegujuruv.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/26739576570.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 18880 bytes
SHA-256: 60d1b394069ed434cb9db930d9309671daf89ff4265098c2d3ed942fea141f4c
font_01_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 10632 bytes
SHA-256: 19c88e5085a79d0528d93cd6e5ee9f7d826b5453f5a7890dfcb4e82517322a56