Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3372a5c3de96560…

MALICIOUS

PDF

92.2 KB Created: 2021-10-06 00:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86caf14975a3173c1d265f1b131ca8ac SHA-1: 728be80c9dbd266b40d15a2e4778a36e72f41499 SHA-256: f3372a5c3de96560f0a2728aa95f0c0b8cfb9d596bde7155752d723efb47e706
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest this PDF is designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sedefartphotography.com/resimler/files/fepuleruzisewewuwuk.pdf In PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/jusibugajobupusosezati.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/86805066309.pdfIn PDF document text
    • https://oasis-travel.ro/files/boxemosawuziravi.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/38702749312.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e1b6247c8---1232221914.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/rumolap.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/xitipikuvovolerimi.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/putunowura.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r2t0l9tfs7abufdoh1s3b2rb6p/16222374630.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/21251620825.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155b71de937d---zomurefufesusetolemaf.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/90470626527.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/5863171668.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/90328772978.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/36069770592.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/81565161943.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/36759904361.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/lebuzesopuvigozuxiba.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20211002_97190266C7644B82.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutisupalerib.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/47470421470.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eaee249b405538d558ce5689b97c6b73/vujobunuxexukozutaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chronological+style+of+news+writingPDF 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_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10848 bytes
SHA-256: 41a9d6028a377b0928465aa5554f9c5a49168476a9baa87ca3603993a4e3b89c
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 20256 bytes
SHA-256: 4cba99096a79b88dba5340eb47383c517b4b63f9cec5748e1aa82ed5c15089a3

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