Malicious PDF — malware analysis report

Static analysis result for SHA-256 7253158eccae9d3f…

MALICIOUS

PDF

107.2 KB Created: 2021-06-28 14:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f56cfd00c319e8b294324172bbc2be0 SHA-1: d0865ebf9d9e43d2b7d9ef40b59aa600172b0712 SHA-256: 7253158eccae9d3f051e7acd822c37b1081941c685e3a4c735fec3c1a7be1fab
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to execute malicious actions within PDF documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests an attempt to distribute malicious content or phish users by redirecting them through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/cu1o1p9dmfjmcdfbvcprh6s9vb/21934039564.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/acoupu7lhu77153e8u8jhn95f3/xurekuj.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77227367301.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285fcdd350---29992864928.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/16463137806.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c303430ae0c98fce1f69087b3c8b9327/runumefudokutusegusu.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/49421095966.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/2459067632.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wunizoxazavesotig.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7gllmvoernbjodju9g2c2d5rt6/91734642199.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b036cef45---69607507006.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11b7fa10e69f7bf3c174693eeeec4654/bulewupaxukixubeposama.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/memoguvunepilukunutasi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1cd8c32---lonaz.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3032e86869---tolamu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rmpd6h7u051ig8o7865an2jbua/40057353461.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba853e87736---19505881757.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b87e3d0821eea4e20355e429972737f7/95662704378.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210618181110.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/81623072943.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1984166ebc---pexuwanusuvukuronixalow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=get+me+out+of+here+2020PDF 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_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 18596 bytes
SHA-256: c6e03bad47a687c4c64ee168291e90fcba8f7873da39a68170393e1710d2940b
font_01_sfnt_off000170c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C5 10288 bytes
SHA-256: 4845928d8e7a311474e4bd3a03106f8c0c5c549b3195da3a4e2e44bdf9896e6a
font_02_sfnt_off00018803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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