Malicious PDF — malware analysis report

Static analysis result for SHA-256 f418430dba384b0d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 23:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba3dd0b52558e6931b8a353e715f0d7f SHA-1: 4a5c49412695216bb375b985f7f5bb37bdd9e799 SHA-256: f418430dba384b0d9ee16fb1afaf98f1f5f26d8b2d32a9849205f16e29ee36ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV and ML classifiers strongly flagging it as malicious phishing content. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://harryreichert.de/uploaded_pics/News/file/97312060360.pdf In PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/25864922769.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rudiwikexir.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/lanuwugisezekuzu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mazatiluwipijimizasejo.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/junikixoxes.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/wejefoxixag.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/mewodo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9625e09a---zugabibejixevanafewurukiz.pdfIn PDF document text
    • http://espwireless.net/uploads/file/91463707641.pdfIn PDF document text
    • https://linardi.ru/files/file/wadaxuz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/notusodezepev.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zuboxoxiludewanawukadeje.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/30938710308.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/dujakorus.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1v4uq2hgcft9g1mij887fundd4/18621277039.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/wanojajewujadav.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197848285204.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/supek.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109161636284147.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/18162556043.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa056b4dd---gefebisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+android+to+iosPDF 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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10372 bytes
SHA-256: 1e3812cb6d01171d8676569ff629e5ea7fff875f5e6a71ed516116d96405db31
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 18000 bytes
SHA-256: 9f975a0c9f2bd62ad9160c25e3ed5edf106b1cf0bc8d65475694735fba780ff9

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