Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb415e3209cf97da…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 23:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0045b771c4fb10a4b9254c01eb45c725 SHA-1: 81806a7356ec8e9f15fad4e954c2fa23e323d78c SHA-256: bb415e3209cf97dae3562adcc1b8da567e383c1bbe4c6136da7795bf6ab2ee92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are indicative of a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://b-solutions.net/userfiles/file/dunetenilavobegab.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f1757765e70529579f45adc2023bd97f/89760681528.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85247d0679---zuparimonivaruzik.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7b59d99fcc9b318f14848bad36965bb2/pifewukafenokurolub.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7a5002ff2b611ae64a591ef8329266ac/94088274523.pdf
    • https://artasedanasingaraja.com/uploadfck/file/sovozowimomesixumeze.pdf
    • https://samoinstitute.mn/uploads/assets/file/87742944835.pdf
    • http://aliglobshop.com/userfiles/file/64932239395.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49d11c757---davalezekoxobotijadobare.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f8d603b99d994809f9656b3902cadf89/dedabifi.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/57pfta3c7f01akskp27q0rkjf6/69427941042.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/samexedujovi.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0351e4f3f7---40919953482.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6e43abd8---narikakilavuvexiwawajet.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42e5a2c5d---bekijo.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bba45a28a6be89179b05df30adc4502a/temuxitaxuzirodazuganuf.pdf
    • http://ahcxdq.com/uploads/file/080713086454.pdf
    • http://rolmech-strzelno.pl/Upload/file/lovakukota.pdf
    • http://kinel-hunter.ru/upfiles/file/pamijojeki.pdf
    • http://botosani.ro/img/uploads/file/kurapekemagikefudabizoto.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e8bcfa9fcd12d3e3a6c85d1737582fff/17993085053.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/643d58ef095b53bb39a81344254073fd/xizawoxaxetaz.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69911126341.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c83dc873b9---movidibalesup.pdf
    • http://sungsam.net/userData/board/file/revigurujokexekokeseze.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099c26ae67fa---lonerexemamonubuso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=centroid+of+polygon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin
630386b8faebb52123586478685f26fa0a42eb6bc1af36a8954086cd1f807b62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 17856 bytes
font_01_sfnt_off00011e99.bin
41e5af9d5c0c1b8a7efa38be6e292c104fe32b433f3b9cd992aeddc7eaf3692f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10488 bytes
font_02_sfnt_off00013659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes