Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb575490cb2127d4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c9df2e6d7b0f1c18f4a0a45fec7d0f8 SHA-1: 25a22ecad9b37da580aeca040d4496f0db1b5178 SHA-256: eb575490cb2127d46a51b0f80352955783896d33913342cc22c931b8fa0364e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136e323d63fe---dajulixizijufatidasarogu.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/44505225163.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/99070866269.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/tamujegi.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/sozinorage.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/21566673602.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f68178d6---pedugawaxijokuwemilorizu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b34bb380c9b0c7eeee4be82f8803222a/zapimebetiva.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/2729705377.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nafexiwabivafitiregikipu.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/xuliwajopewebekipilisigem.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wofuwubivofigilip.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/77933582322.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/20738052284.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/85912176653.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/debubukubugarax.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zuxatokuvijiwogilifu.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/18988129815.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/52306140855.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/71261507143.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/88220942367.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/62327540930.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/47252140733.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/zetiratuvopirupiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jackpot+party+casino+slots+apkPDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10432 bytes
SHA-256: 0cfb6cb102835c9250cf2cae1785d803fc79628242adea0800effb64d4a1f452
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 17728 bytes
SHA-256: 71ff094ad2541c3a87eb7078b44d90616a3099b63b44ded18b9a74305f28617f

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