Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bd982bdd08ac17…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec069f1b7a004bdcc26a2444bcaf638a SHA-1: e0c11bef3477f38b3fd8987fd2f344d96232880d SHA-256: e5bd982bdd08ac175489e21aedbcdd8df5db5d8c7bf79231f36e20fdd9d466fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, hosting numerous links to other PDF files, many of which are hosted on compromised CMS upload directories. The presence of a 'download button' heuristic further suggests a lure to download malicious content. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb7c3175---binokurodogo.pdf In PDF document text
    • http://efeotokiralama.com/Upload/file/50369160303.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/20853075423.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/94880675145.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/togajiwabatonejo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pegapozotil.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/68791485818.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c78a4f5b7962ad315be08cc48efb3f01/fuzixinaw.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090407441273499.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/rozotobevutisezotokogu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/9873012500.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/terumuguzobibel.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb83bba8c---tejufekijoxusokupav.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48559542836.pdfIn PDF document text
    • http://melvin.cz/data/muxaduzo.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/futobugaxubovatobo.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/42389188255.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gonijulexujudumala.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/luzagopamataxosokuzope.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161368983daf65---kegikuratus.pdfIn PDF document text
    • http://rivucota.com/upload/files/54384042028.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/tixemumolapanep.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/166f5d394cef715a46e4342fc0fd3f4f/mibisifevetisivewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+robux+websitePDF 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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10496 bytes
SHA-256: 09a52e1057bd8c60ba37bbc0682d4ffd2485a11fd9c03185c37cf3701b2ff2ce
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 17924 bytes
SHA-256: 5f75bf78223cefd7d336fdb1ea99a65aa29216ea81a6e9d4c4f16656b4ff71a2

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