Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f8cdc3cdc9ef7…

MALICIOUS

PDF

84.1 KB Created: 2021-07-24 15:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1da7996e967d96a11daf13a3f05b615 SHA-1: 4f9346ccd3dbe749166620424a5f33e3250bbd37 SHA-256: 553f8cdc3cdc9ef74f94cb6e1f75efc63f9545a8e1ced278a2b6fc0a844932ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters further support this phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28fb127b8---xudenomaxor.pdf In PDF document text
    • http://ozkayalartrans.com/userfiles/file/sujakomenezokawoletidajug.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/terivi.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740ec064fd7---57992537701.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0927b985a---pebubobopej.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/19614985679.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wewetasuduto.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/78398447159.pdfIn PDF document text
    • https://nevisnews.com/userfiles/liwodofofelubusijuda.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/36945d4a3ffe09bfdc74e6b50b65031e/juxulofej.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/80328197983.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af80ecfc61---konijudono.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/63900335020.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tixofatezijexirijoj.pdfIn PDF document text
    • http://amandamaitland.com/images/file/bixugewoti.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/98766470425.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1efd725043---rexep.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/587fqubfhlhuh7a4b6rdhdc8a5/ripimesidedosewekob.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/faketakelanaviso.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f63b034e43db6d40cf0122f83ca7d686/63218157568.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fi4l542a1tfq4n76pfuaa6rfj8/jetijozesofijikonage.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/regenupokezexawitusejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adobe+reader+9+free+download+offline+installerPDF 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_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 17244 bytes
SHA-256: a9e48195d781fa7de360fb0dcadec72ead02a03fc51259398d20d89aaed50b4f
font_01_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 10720 bytes
SHA-256: cc3ea035c6c269ebfcbfa37279d500f43ea94995f0cc73ced6abf8b28ea7c643
font_02_sfnt_off00012aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1