Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16208f497a41aed…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 03:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 004d917771ea877d5d075f6d6939cfd7 SHA-1: 48ea2e0aa0a474c31fd80867b5caa046a592f98e SHA-256: b16208f497a41aed8fe2f412df4b0d4b1eb69e2f84cb1efb34fcb0cb49e273fe
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://aarogyamedico.com/userfiles/file/bijefofipeki.pdf In PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zaniwonapidudim.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/7281718607.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pnblc7igl3clgtj81n6hf5cf67/89464034642.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/043f0068aa83051e0972657a89637640/33724788106.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c35786a75a41d7a25b0f8808d56ca85f/loxuzakenuk.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210702113709.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/91138570146.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba5c7e7d7---guserimew.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/81076944240.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/pojivefogoxomekamiba.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3de4ac2a8---zozikufawusakeriwar.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/18190208240.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b818900d---74386878125.pdfIn PDF document text
    • https://eternalbliss.net/file/83342187288.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vasuwofabusoxusamizifisaw.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/foditutunakigukoxo.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919eb984a4---36506641754.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5c229889---bibudurevowagesa.pdfIn PDF document text
    • http://brlairport.com/images/file/loladinoguvaveloxapub.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zerogawurulasul.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/674c908f30af64a17ac684a397d13e2f/39162956921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roasted+whole+beetsPDF 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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 18080 bytes
SHA-256: 2ffa2c6d0ba47f48111428fc30ea22eb9b6536977041955f1e8f713fa109bb40
font_01_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 10320 bytes
SHA-256: 4352258740d6a9fcb3cc4e8ea7ec5bfbfd88a56c49691d0f0b61c2946a7bd152
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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