Malicious PDF — malware analysis report

Static analysis result for SHA-256 49632494b0e10d7a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 10:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: daa68de45f44efe8595e234ccde79a8d SHA-1: fee29ce49f0da710f68773d5f3fe7b612bac3408 SHA-256: 49632494b0e10d7a298fef5329ae5790d935ad28b59f7af1afc3d0eb10fe8569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://centralcogtc.com/uploads/file/83272844219.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/85411557855.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f12f0f1a---rudakuwijaxojaropugux.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/99738943261.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/77g8dkpqhk2s8p4djkblup7ov2/85703871950.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/segobuzanakukirud.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/3008958340.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dolurisideremesasozovug.pdfIn PDF document text
    • http://ausafe.net/images/art/files/6226468420.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/resuda.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/95d9b29d76733729f0c0c2075afd16ae/kepagabuxitixarubix.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109141401541929.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/87547318439.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelijobim.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/99673948483.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/86538745142.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/vinofemizamojemazaxozutir.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lojunedulefebipeta.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/32213288712.pdfIn PDF document text
    • http://vhshf.de/File/36269310797.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xuruj.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/kipojizofugijasowepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+nds+on+androidPDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 10128 bytes
SHA-256: 8e4e7d835e44586e8452124746542477980ebbf933f5f6e84fe22bf2cd4a7afa
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17836 bytes
SHA-256: 9cf44d4955b85121b155c13dc283a89d16a48eb94a2bc50eace66a95bcf125fc
font_02_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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