Malicious PDF — malware analysis report

Static analysis result for SHA-256 a154d2fa6907cbfa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 08:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b73c207da80801be82d3969da91d2d8 SHA-1: 09703ef3d1161fd7e3264ce28fd16573e5f3a8a4 SHA-256: a154d2fa6907cbfa555f9d45411c9d38787c31420c4a73ee2163a0c5dbfbea20
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload. The presence of a download button lure further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rosettes.it/userfiles/file/10189360405.pdf In PDF document text
    • http://ahnil.com/userData/board/file/51882956025.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/xotewitetijakademun.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3b3ee0162756cbd35bf453bf32ac8770/xizavejawi.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/1816310806.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/68990645856.pdfIn PDF document text
    • http://lactopad.com/uploads/files/13975519921.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/27901086266.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/27468465881.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/811956206.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xavuvitutanidetifis.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/pufonubigeziveko.pdfIn PDF document text
    • https://spacio.hk/attachment/file/700465996.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e2ba3ef6---69364771516.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/63594967131.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3d37b4bcf43371018e5de0e389a10780/57524367760.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fudobuxusedekisozekexufu.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/kunerevexurunebusorilep.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/30446439835.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/722s7h1i20a5uusee0ffjunobv/sogenijatorew.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/2512992023.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/vososum.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/pafuxakojifamalazixib.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb8459e79---77337783641.pdfIn PDF document text
    • https://superpart.com/files/48367334174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=marvel+vs+capcom+2+mobile+apkPDF 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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 10744 bytes
SHA-256: 980fa95b874380ac403b3f3a6c3845b9c06886d0f40c8e1009aa39046daf175e
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 17948 bytes
SHA-256: 0053de73e16bce1033a14403939bd31609ee98210989265a48ced36afeffd454

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