Malicious PDF — malware analysis report

Static analysis result for SHA-256 1762b270f9915329…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a832ad269c18ee4bb4f63081093a443b SHA-1: 7e0dd082be9ff504e9bdee31dc5c297f58d75d8d SHA-256: 1762b270f9915329be89706402547b30339f7460f1f775c5aa2ddb920ba452f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress uploads or disposable hosting. This suggests a phishing or malicious redirection attempt, likely designed to lure users into clicking links that lead to further compromise. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://liantoong.com/archive/upload/files/18519271205.pdf In PDF document text
    • http://machulski.com/public/file/bezasugefofopun.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd592398cf---rutap.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902091009.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/40520855359.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/32691986397.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/42843595190.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/70620949022.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/6231804028.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kupevutazikipepe.pdfIn PDF document text
    • http://kmsenior.org/file/files/40049836943.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/46222099653.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbdee8a0f---31418647819.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/dovalose.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/6743225721.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/88038262717.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/78578839946.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0fab0459101fc0667e41105fc98d7e32/xixifanagibopupirigo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/sowuxofesijiledemos.pdfIn PDF document text
    • http://arucax.am/user_images/file/momulalasadudamopuzono.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907155222.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2d332348---jagotuvu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/65646475025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bicycle+charity+near+mePDF 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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 15168 bytes
SHA-256: f2b7921c5b4e605d2f8e9020875397e10c3e9ad8c3eee8bbe32905fb9db9e99e
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 10376 bytes
SHA-256: a2bc046b0379bb11e3fd7ac19847fc58ca8e83fc9b7a66dc42bbc0d6d5e97009
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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