Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa128a9616bb6af…

MALICIOUS

PDF

110.4 KB Created: 2021-07-18 02:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96397873d9f18fed4d7f07bca6e3250f SHA-1: 8c1b8003aa7ee48fad463f119d401c36517ee5c0 SHA-256: daa128a9616bb6afa33ca7bdbdc50cdc3e30c4339f95c3db682bfdeb6b966ff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO poisoning. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://cgeminfos.ma/upload/file/zetekulufefanobekutudinin.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b71409f039e---vafapuwurafafujekoluravut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d29305cde---sobexo.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/dqurutlfu2sdes93iujejp18hi/fusavepibi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xezap.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70e3b3134---rojosibiledukopufawiben.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/ebacd27fc40bad49b21855d66ab1d65b/78856380284.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tejojotudoderuni.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16096188f906d4---20198685704.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bf9e7c8c90fee15df1ca89a8baa1570b/58347995615.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fafd2fc60fb5e205021bfb52b058f092/11260432404.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496621490f---59197022514.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/razuj.pdfIn PDF document text
    • https://areicon.com/images/file/10606084093.pdfIn PDF document text
    • http://citra.cl/userfiles/file/sunaresamefekosaxige.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/55215653510.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/33499020713.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/73662974649.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/17947550463.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/74800544887.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8bc3473b---torov.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80f1eb764---filalufu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/1747330772.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wobivofutolilal.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ninefirevokob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=historically+chief+material+for+making+furniture+toeflPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16332 bytes
SHA-256: 4bcab97dc0f838981b5f4e0f36f038a4f20c421247db1dc0553070fbb4faaeb9
font_01_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 30812 bytes
SHA-256: d8f6de3450c0ba64b7bf52a72379f8f325f30fb9799ebec4048430a7f6968246
font_02_sfnt_off0001792c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792C 11080 bytes
SHA-256: ae56a1d00cf435496f85df549dec0756bf30d4a89985c27011d2bc54accc2e0b
font_03_sfnt_off000192df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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