Malicious PDF — malware analysis report

Static analysis result for SHA-256 1377b6ac1b7cdbb2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 14:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49993b52bea06225e6404f6bbf019e16 SHA-1: 64b2f5acee7afef6cb82a03bb087c07fcc7c0906 SHA-256: 1377b6ac1b7cdbb22e1e1e002998cade5bb3c3a2bdc7e5846efb379d75305ced
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cplastik.net/data/cms/file/bukarosutasubep.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/bibimitotajugawimagimaro.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/914287f9e4a55030098d52af12a33745/10784088406.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/78970334247.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/jurozavomer.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/fesexuzofov.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16131af26678b6---toxigotuz.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613175dd0aecd---85674788788.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/98660048849.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/jipuzonugiposuxifogevo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bulefokuwitapimemobozomu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84610053805.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/sezurevulerezeberezaj.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/89397329911.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/33209161214.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sukipolodikoketow.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630651018.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zovabuzi.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/gubutawejiwowig.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/51247553846.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/13559446304.pdfIn PDF document text
    • https://ayurmitra.com/files/file/sukow.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/40150594987.pdfIn PDF document text
    • https://clove7.com/userfiles/file/vusejofulegunanogidiroz.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/31808927361.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/37162420693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=subir+volumen+microfono+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 17696 bytes
SHA-256: 1f05d8909ffd8c2d76b73bd962f96bc54b70cba22a4aba93c06fb18d7dbdd4d7
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10752 bytes
SHA-256: 0c7e3d830a70381fa7f3827b5dc5cc7d447ff3183aa1275986de01a42ac52dea
font_02_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 17780 bytes
SHA-256: 661b0085ca6c359a57407c622b22e476c01538b30480a3f8580bc817d607cbdb

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