Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5166fd699e59c32…

MALICIOUS

PDF

85.2 KB Created: 2021-08-24 10:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ddfbe6a7d797d4e0748470f9b252a0b SHA-1: c22f56a81b294cde06a2d4ad9bae1ddaa601fa6d SHA-256: e5166fd699e59c3242b4fb8252b50aa95f829f3cceaf86df4bd7f1dc546c1e84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the nature of the URLs and the heuristic firings suggest this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=1914+s+penny+value PDF link annotation
    • http://boilerservis.ru/uploads/files/13052159622.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c835cf4d14d6911dccbd0f68a5c3957b/tomelaxopudixovaxapuzil.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/senaluginoter.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210716_73968905751AA93E.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa4fdaa72---pujirezajidigikanepan.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b789366043b---66629983182.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070f682a1c27---nosim.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/76412522256.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2d42c676c---53171168016.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d878ba787---96827254099.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/63153463570.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/bavuretajakovenugudop.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b72f728db---lozeke.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/lanavafemowojeke.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e60b3ec9b07---lupakatelit.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/68123153884.pdfIn PDF document text
    • http://sksound.com/userfiles/file/rolivaz.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mefagopesave.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3af9878f3f97866c0f033a8a5375a5df/70511595833.pdfIn PDF document text
    • http://juentai.com/userfiles/files/lojedela.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e8cc67e9---nojoros.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa5a3b4a7---57404983197.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/49315441528.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88fe4cabf7---46635370005.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/fumopukakololigi.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 10316 bytes
SHA-256: 775af37171aa5905a947004b3cbf042087401fe4e24d7b81a83d332040815e47
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 17800 bytes
SHA-256: c5f4092b945a54bf0274b57f49e8b694c04a44f537bcc378190adcaba0023a27

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