Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd5fd8a1b4341c6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-25 17:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7eb8b5379813a6c5485afa5bf7f8c42f SHA-1: 66af92177c2bf36d7d840845dd9c6f5df9d54189 SHA-256: acd5fd8a1b4341c66122e09c0a2992c8423b9b6cb322dde065d5271330c401de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous links pointing to compromised WordPress uploads and disposable hosting. The document body was unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079910430445---wimuzoni.pdf In PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/rurumol.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb3798f2e---tewevesuvodanaku.pdfIn PDF document text
    • http://palami.by/images/file/81329314811.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/19214254653.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761fcfb9e6e---41290235610.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac087c2c75d---14498133905.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/86375825738.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ec596dee8a54cb88e73ea3335e8cb6e6/42585857932.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a439cdb89---xefidir.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/rusekifup.pdfIn PDF document text
    • http://limoride.net/gallery/file/pimotawozedojefekov.pdfIn PDF document text
    • https://eurotig.ro/file/12230317484.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/66843530258.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/30fgsvdcqatmnt9dbt674mom4g/nawutugegoze.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kggt895bu7sim5mjls255dbaa0/54165292305.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lirobupivedufupu.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/58674260996.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2202bc886718e346774e34461495c4b9/48170273421.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f1ddee65ed1502f68cd5c920efcf6c13/zomojodadiwozubojusape.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/70091750522.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/5954114513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=is+veryfitpro+app+freePDF 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_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16688 bytes
SHA-256: 80cd9ecdc87489a2e4ccb867a0128eceed793406a4a24a5f0a4e968748e43ff4
font_01_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 10332 bytes
SHA-256: 8aafc6f2609b83ac2cb4ec84354bcd2fedf39562cf9c0161136b3b864af591fb
font_02_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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