Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aeb6afdd2b13aeb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 01:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c0f7f84cd69d940087ec9f27e0e9e30 SHA-1: 3e298a6b399beeecf4c236b907d7122d5cd427bd SHA-256: 7aeb6afdd2b13aeba99758ce9be968ec7c8ca7322bd23f1f8d68433a20403954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to external sites. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=best+android+phone+without+hanging+problem PDF link annotation
    • http://sunway.me/uploads/file/092240199627.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bagutisekogojige.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/59714985985.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/lerowa.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/robitalijit.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb88defa1ee469d47b593ddd16904301/dowarubebezowofirofozufo.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/21709913453.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161413f57d6966---8771846156.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/navunewozabetoxoze.pdfIn PDF document text
    • http://alvitraders.com/files/vanafosubakup.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/88906994089.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d3bd5b6dff192cf2739c8f5bff306d80/fiwol.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/zubavurikaruf.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/ganapigejanuwoduwot.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/jexefuj.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nuretorivi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613051b70d105---9921352312.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/36689489274.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/37191254485.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140b316307ce---69753334323.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/99036494097.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/38427532542.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/xudasokitila.pdfIn PDF document text
    • 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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 17620 bytes
SHA-256: 273cf8297b778d8a0a19d6b43dd2a6f1c6e61686072bfffa7a9db0a93d5198fa
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 11220 bytes
SHA-256: 52cf7cfb19f7d99caac73b0815c6ce9a9bf71da56a985e52472b4ad1921aff7a
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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