Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa490b395f491fe…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 20:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0794ecc15378a55e8e26be8a786aadea SHA-1: 28de93535c9fd34531d38f64c8c59bc7e46ef5b8 SHA-256: dfa490b395f491fe80a6f8c6a86a396bd60fad54e1752ede3ffd697f6b575c1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories and disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download or redirect to further malicious content. The link farm structure indicates a deliberate effort to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://embassyinvietnam.com/webroot/img/files/43618239061.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609739cc75df7---kejevosubinumezojikasubi.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lixibisodojiwoxu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/50647983656.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8ni764a3li1gpnd5tpgesca9t/kikelurejakupokemuf.pdfIn PDF document text
    • http://snft.ro/media/file/48309915580.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d24212b06a33ac1100263a0da6296728/vuwafudega.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/limofidokaxev.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/datozizepibepegovuxapewa.pdfIn PDF document text
    • https://negaratoto.com/contents//files/xugagasanez.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c2d4781a---28847266026.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/depoveriweru.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/sideponuweruwosa.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/74961837630.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/415061481.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/derebabumozupelidijujube.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tekegorabexelatikonopapuj.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/81658683831.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d6b5588b68ad2fa3cf971fac88e5f1c7/dozuwakewezezebofinase.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1001ae0c9a8ef9c8e58fa8d13ce9cc1c/gufizixo.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/digulisum.pdfIn PDF document text
    • https://davnosti.ru/upload/dexazenaluwufe.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5f67b152---ziberunu.pdfIn PDF document text
    • http://ledins.lv/cms/file/54427649544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=seventh+chords+guitar+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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 11092 bytes
SHA-256: d3f4f271249d4b9e07fc4b47ddef442e6b7bb61b2232bec7dc05d574e48b9118
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 18488 bytes
SHA-256: 988ee1601e22c9f78e18cae1b6521a6011206d1bb0052ec2c0ebf25a10e8a3f9
font_02_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.