Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ff61cf2abf7cb1…

MALICIOUS

PDF

92.0 KB Created: 2021-07-27 20:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e6a7c930f9f363f467a891b0c91ada07 SHA-1: 0d8f5b2e7d311a771cdc048ba770fa7e77554156 SHA-256: 09ff61cf2abf7cb1e4ddb80b5e62a44136cf6128f507997f741bb8d158a1a01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress sites and other unknown hosts, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a457ec92b---fizikupuja.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d3eac5b17f65809c6f5f8be981a41de6/rofakomevezuvalupokor.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d692a6d01900b8086d9da096edf4ca70/68355796510.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/83451081920.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/83950227732.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/ribimefikaxidisezedojadus.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/nubiwepadovenogaveres.pdfIn PDF document text
    • https://daismene.it/file/xivazafer.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/befomaseguvewenip.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xazofuxotumotew.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608260489aa20---61323334039.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f7747534e067b65e5fc11920b04e6118/juwepotosixuvinexo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/35615739071.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fadbeab4f4fa847b5d69f70834b0a978/ridogegisogujuvopadok.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/933cba7ed815e320f96180eda23d4c31/81113697303.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/33138776109.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/virin.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/pawixolamozodopuni.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/81352887460.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f1ab0fc9f5fbbdbf2aab3b81d178182a/jaziramudapix.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c7fff9a2f5a632789436a287690b6059/65125239142.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/ditirujobipiluduvil.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/niros.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/21062304506.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18sq31jb18e2cqd6hal9jrui32/notepafomiber.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106040121262334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=short+cover+letter+for+job+application+pdfPDF 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_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10960 bytes
SHA-256: 96a4932b664dbe76498c5dc367241700433bc2abd579e0edd135945fa5a74556
font_02_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 16500 bytes
SHA-256: 8c88f10a6ed516983e5afa6325055be530636707cce9dbf461889820bc40d076