Malicious PDF — malware analysis report

Static analysis result for SHA-256 38131cf288b4baa2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 14:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5aa3cf277c5f0e1e21a09b7bc6b0934 SHA-1: f5f9d82368255871efa40f1fd19aa5baf1575ef7 SHA-256: 38131cf288b4baa2b3b5ed425cd875dcdd78996cac497aef7c15cf83a381045e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs likely redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103978b171c8---14105813277.pdf In PDF document text
    • http://kite-surf.sk/files/64103485510.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6445df6d---gepurimimarisozolomej.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/43530883769.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33d15e64f---37584467373.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607259085adb0---nanilenofopigifopifaro.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/binoba.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/080399cabdae5ecf38dfcdf067e8cb5c/dodonenivufewa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098458e9fcb1---tajis.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f84bb5534965c1c1622e44d2fec7e97/befozibubusod.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/kavujilunurolumuwanolo.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kamowuzuvoroxir.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa6c123a04---62703979890.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7667084524.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/wubaf.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kiton.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9kjrh9e740ithket7v2aa1809/koropominuxowijekoxi.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/nuromowarezufug.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/88924298127.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/43843913650.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/37990002676.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/22915084395.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/34178930591.pdfIn PDF document text
    • https://songhong.info/userfiles/file/44258049369.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/37789523864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=que+es+la+molalidad+en+quimica+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_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 19092 bytes
SHA-256: 8c5c17d3367c354c3f94568846a2cf3ca76d258175b0b06189d88f3744b000ca
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10888 bytes
SHA-256: ccc57083e5b63f96c82f1087d4ed1bea9286b153e4eeac48a5da80277aa7babd
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1