Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fefd75149d2a8b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-04 22:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2684b08bb0a1cba898ed5a0dbea2672 SHA-1: 7f6bbb5d1efeaa43deee98e08bbe8e1fe23a89ac SHA-256: f7fefd75149d2a8bb59cba8e34a5ddc92a922105e2cadae36f6514f61743e0e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856fb6fc84---407778251.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0njbju5jdvn0drn0sh43tcgill/diwex.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/78881263640.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/384d2a80957c706c527506348edb0943/9221408804.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/tenixotapubeji.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/abd38778aade12d072c90419fe176353/1646676077.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-27/20210527204444546841.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/61274140910.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tazat.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/52463353180.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/lonigaf.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pat8v7f34vkomdjdm9airg5ta1/lavafegaji.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2elrh74c9nor7klgpsg326gj4t/67471631163.pdfIn PDF document text
    • http://bronia.org/userfiles/file/dolejiwe.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/wupalik.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69f7d3d411---jovadinujabuvusoxivike.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1c2468127---63740931702.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/tinafitugiwafoge.pdfIn PDF document text
    • https://steammining.com/userfiles/file/51388243241.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7d45d71b956ec65ebd814be963834c76/48970309234.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bowisamabibaxizidali.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e757c41ffb---87316446005.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/61288298767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=geno+grinder+2010+manualPDF 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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 10756 bytes
SHA-256: d97ec0b6f876335f47fe0351c46709ec317d3d0bb6332648b9b2f434ad557a16
font_01_sfnt_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 14164 bytes
SHA-256: 787e6afede0146476e1f5a840463a91c58f32937dd8864224830e1b49373fed3
font_02_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1