Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cedae534b49261…

MALICIOUS

PDF

123.8 KB Created: 2021-07-18 01:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ae640c60b98e2353c1b877818e90184a SHA-1: 72293d7745fac32554bd6c8e71618d7da1bc0988 SHA-256: a9cedae534b49261a7cc9b5ccb2b74b5d5e52807981df4e25241bea5811cb9ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a8b374bc---rurufebazipetupopewet.pdf In PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/vedelo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8i0ajk1epkaq83pfv419boi701/8850268231.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b1t38gja7enbpjtd9hie39h5e7/19562279895.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9d95ef9436a8f8011d5128706603601/zitigabogexetasifir.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c66618ae---vupefivumejunatumito.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/92604847713.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/643e5f8419d55d58a1329a28b9b5ae36/73207887786.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///99109899424.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/jesejupuxagetod.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a79f1d15---vazovotirifa.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/zudoziwinutexujig.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/43186851262.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/wuzijakumidajuxuvazifid.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0d98df08---23309967243.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210615175903_end43r.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/44688027768.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/tujurenulojumuba.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a123631455---sezukogodejezu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fba9247ad---74459112554.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/53939866852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hypocholesterolemia+is+linked+toPDF 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_off00017964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17964 21124 bytes
SHA-256: b2bca672894684f998146e2282c1dd4ff1c4e594a30a0258e958b37f1683df83
font_01_sfnt_off0001b0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8DE 10976 bytes
SHA-256: f16e4d3b3cfd39bd81734f9d562d9655fe7e36e1aee34e419b0ffaa5e6c60401

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