Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8940dd41085484c…

MALICIOUS

PDF

74.2 KB Created: 2021-08-22 04:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09d52a7c6c5c5a5cbe2a82a95bd24bc4 SHA-1: caa6646c8103284edadee6e0a7211a324e113ba9 SHA-256: a8940dd41085484c5f8be1d19947547f2fcc8183d652adc63cb8b945d1fad6fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=queen+of+the+damned+full+movie+in+hindi+hd PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1478c698f---54357650435.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/38624097277.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/53700992627.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/tuxifogud.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27d652354---91753902086.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/40714307192.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/97285367841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f8a5f83f---12095197981.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/16711845440.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/5213226394.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2ce497c474c74c4b31bc754723b9cc8d/tabux.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb59e5837a---98394505610.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/liposutezimajowa.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/virevebatibefukifafe.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/401fd500d5eaa4da59ab6164a001719e/xikeripuriwi.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/1446625516.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3828068b---72383538854.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tjneo9n9jp097sil1tritgbsk7/16921413176.pdfIn PDF document text
    • http://accronline.com/userfiles/file/33690924319.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/favaliponejaw.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tevonuzujozitovofekidili.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jj421etgskgrpmaj2rf3bqtao8/sevix.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b7d2ba6c---vewolopuduxilika.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/duzatikimeg.pdfIn PDF document text
    • 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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 15612 bytes
SHA-256: ec361376cb43fbbd2200b59995582a395be444cf7556469677751b5d860bcf60
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 10576 bytes
SHA-256: 1ccad7bd57d9dd6e9a8de5b17c4349f2379e302ee4dcf0c872d3cb62200b87ac

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