Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f0fd35b729ded8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 06:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31ca039643d085d9d28d2c9ec3502f8d SHA-1: 48c715683c40327a926ae2dd8af9b0f4fc7e4db3 SHA-256: b0f0fd35b729ded87c1fda3a66ebc7f021bfcb5c48d8c2a1dcebada0377dd7fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm with numerous URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious payloads or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://chocoenglish.com/_UploadFile/Images/file/64643813532.pdf In PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tipefike.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/8290253817.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tkaajqk12deqgtr16vmgmirota/mejavabifiberigobitevadaf.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zafiwixulunonoxa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4ca97d7c74ae740900bc22b5c99b9f77/luwifamawefutu.pdfIn PDF document text
    • http://coachhouse.info/assets/file/26835534108.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/menodusezovuwow.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/29218042174.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/danekifatepaxugi.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/41779611681.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/susul.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/mugip.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/xagetarodafu.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/54121200625.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/19374043027.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sedonaz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2730a3782f414ace3c07bcefec23367b/12520315599.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/15906775625.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/xejojivugugenin.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gupazavomenozijud.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xuvutesafijoteputaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+recover+jks+filePDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 17704 bytes
SHA-256: 26f50a289652a3e189fa5024590d54e52c19f100aab9516bdca5b93953efc0ff
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 10428 bytes
SHA-256: f6c03694d90561c7038520b8e12efd537df993280d91baba98cb98cb60bc0ce4

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