Malicious PDF — malware analysis report

Static analysis result for SHA-256 092a9c4b08546823…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 19:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fb52188c7bc74b08bf5bec0898dcdbd SHA-1: accdffe8a0a0f4390ceb4b59626b16fd29bad77b SHA-256: 092a9c4b085468231b356580376e2d5e6d136f8c39223aa542d37978193925b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://peoplefoster.com/pliki/gipobuditomum.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed88e6d5a9---javadegoxopukadekufavu.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rijuzimovolulesibevikej.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/56747039262.pdfIn PDF document text
    • http://sinners-party.de/media/file/48352276314.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/wilozagigibarusi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kelaxifivubajegilorit.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/867cfbd04b598a7f177b1036f7810832/3401719481.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/takero.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/biwegixamuxupixefowolajiw.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/448929985.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nukukuxavokivojes.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tisusodowilinanewas.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/31715268912.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cb8308a90a56b1c8851d12c8d98d70aa/degiwovibatesowitifonosu.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630905805.pdfIn PDF document text
    • http://geasit.it/userfiles/files/napisugepidejefetolukoto.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pedoxetanedabogesu.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/50165691514.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/lezoxiboleliz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454bf412564---61655366857.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a403d1b88d---13242735150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pink+and+purple+mixed+makes+what+colorPDF 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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 11160 bytes
SHA-256: 0c8443eebbb2289e14b75cacb40ba0696330ea0876a46a01fcdabf7219218679
font_01_sfnt_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 17088 bytes
SHA-256: 42031a1b9b9656df7682d22f2986f998dd8c12a6b56a2adcc9767aea1548bb3f

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