Malicious PDF — malware analysis report

Static analysis result for SHA-256 750831d8870897bd…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 15:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f2dff5e5bb5c248c487897082da2991 SHA-1: 7b9e3704841b124a709ca4a268854d753a7db92a SHA-256: 750831d8870897bda129b0915dc6b0b60d85231a107a880911ca101c0d8b5e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.deopendeur.org/imgUser/file/pekezo.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113f62a01809---wobunebulavo.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/914577414.pdfIn PDF document text
    • https://85097781.com/upload/files/1865276741.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd766aaf2---69286302869.pdfIn PDF document text
    • http://surtek.biz/image/files/20150118_163203.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/zubasagiwibadojipoweg.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xopem.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c151b5a504---66202511691.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109010756541174.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/datamatuboxudoboxubajajo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dr1mueuvs2oq3fnmk46an9bbo7/24768530348.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7f8183df---rafubisemizewosuti.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/rudeliroriposu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6259cdb3ab---wuxewolabewopiwujoro.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddcaa6e81---ramanepilof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/89986240174.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd24d6388f7---ruvazemadapoz.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/83451415053.pdfIn PDF document text
    • http://grimastone.ru/files/69197650352.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/78572144023.pdfIn PDF document text
    • http://balone.net/_upload/file///71977781245.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/rapasajujovagukozazoju.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d190cabfd---goliwifom.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fat9gsejo388m4rtlogfsgj2n4/livafawesedamuwabaxomeb.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947740ac52b---95947196918.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/fanejowalebowexuxebonuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=enrutamiento+redes+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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10696 bytes
SHA-256: 740196f4093a810959cb1713fb188d862bae954dbbd3e194833c024c6813cdaf
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 18476 bytes
SHA-256: 51aa7c878ac9a0948223b61a95b287ca54f8d91f4ee40794ec20b67876439ef0
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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