Malicious PDF — malware analysis report

Static analysis result for SHA-256 56af9375d61c9ab1…

MALICIOUS

PDF

312.6 KB Created: 2021-06-25 14:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ac6cc353808d3665f06dbf409cc25b3 SHA-1: 7e84977c42af2e07f1502568def66d380c931504 SHA-256: 56af9375d61c9ab195c9ca815874d9a6b9e5f82a4d8a945b63b85cf108a18af6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity finding for an SEO redirector link farm. The presence of multiple links to compromised CMS upload storage and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and linked URLs indicate an attempt to lure the user to a malicious resource, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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 http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/kesoperetaluwisa.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608965237b732---gevekemivaxelivofapuvipaj.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/buwijowagik.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/xudigupokoxamivojuru.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4609823---73790092575.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a231653a3---29343221192.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef73020ee---1037328581.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/71ca7bef2a9df33ac58f214c97c21b3f/watufutogukiziwu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091547cb21dc---wulowugogelej.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9aaee865---6895570987.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/fajodavimoxuganapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6b18a257---79445568731.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c0dd77e8---pukel.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab635f35c5---7540070867.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uaio8lbrndutsfjbbh6286icfu/juvalitab.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/liperulofekewizofazabejiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=learn+to+drive+manual+nycPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00044e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44E55 3972 bytes
SHA-256: 1e05ec9413f31fbfcadf6da43e73fe3c058eb3aaab4bb7280b13104754dd76c9
font_01_sfnt_off00045d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45D8E 10600 bytes
SHA-256: a3cc0cf54f60666557bcbe5378e118f467c8669639d428901a3256b69d74d840
font_02_sfnt_off000475bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x475BD 29128 bytes
SHA-256: 04efc3c2acc45f5e95f6cda0fb2f3d938f6fb49ba72cf62498260d82ec37b506
font_03_sfnt_off0004bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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