Malicious PDF — malware analysis report

Static analysis result for SHA-256 e655716e78426539…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 12:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e310adb65e8e705e348c785b04891d0 SHA-1: 0a07e7028c1871024322d31127231c16b6135a31 SHA-256: e655716e784265397b879c7c18d71e6933b98613371c5b20e3993cb28eb8fe0c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple external URIs and a link farm structure suggests the primary goal is to redirect users to malicious content.

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://synerhu.ru/uplcv?utm_term=3+ninjas+knuckle+up+123movies PDF link annotation
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peditopewetixenixi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/91714077570.pdfIn PDF document text
    • https://eguiders.com/uploads/85791566743.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/73037906214.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/redolutof.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/lutedinuzum.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/86894307084.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee1b7ed6d---25895651270.pdfIn PDF document text
    • http://umhouses.com/uploads/files/fotipodoxizonumujifo.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/wurusoditenabes.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xafefezowaxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614270c0c43a0---31737038899.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64583397014.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vujuzuv.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0923e4f92cc46ab73a5ea6171d556762/besomiritafajixasij.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/69896193555.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d590659aa4---nomufu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/guzutogo.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/43675244923.pdfIn PDF document text
    • https://tekartltd.com/upload/files/xutebikisenubemoxopikuz.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/85133823427.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/64740802969.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/besulen.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429c7fab5df---gumelunekufilebuxikiveti.pdfIn PDF document text
    • 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_off0000cd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD54 10972 bytes
SHA-256: 8b94e41eea5c190f8a2cd544402793c48acf9b7eed135c84740e05eaa21245e5
font_01_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 20472 bytes
SHA-256: e86e3edf616cb6d171cd3b855a78bedb8d5363f7675ab9f6144125e271c8b1f8
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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