Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a4999173351cbd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 11:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e36b06da90eb8171308f8996ca6ac1c4 SHA-1: 0607be414baee54836884798bdccdf92d4469289 SHA-256: 32a4999173351cbdc5b14e01c2b49d7026aca1596853ed3cb32ba65a3dfac764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting malicious PDFs. The embedded URLs suggest a lure for users seeking PDF reader installers, likely leading to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=pdf+reader+installer+for+windows+10 PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/055f041715431c5319ecc87a59bb0462/70667587641.pdfIn PDF document text
    • https://ismart99.net/upload/files/kadoparoj.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/21240102618.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m8guj41rak8r56i9o9dncf6npp/xofovem.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2a5343fcd---47853643033.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/23792081729.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4af76b1db61b1601143aa45bca1c804/16669698408.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/gojurabemijaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/niriwopowekokobiv.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/45519778634.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d9c45751034c46d76929f0cae0b93a68/62248829849.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2731e8bbbb---sifedojerilevotavilab.pdfIn PDF document text
    • http://faradbox.pl/files/file/pefajepupixolowetuxi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/93655957265.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0fba79f59---53193894874.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kutogini.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/3954474406.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61307921820.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/95311129601.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/17819617987.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/mipalogizenejonazifuza.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089569fb1b0c---xenaz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f6d8fb86---5983665752.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160823e511c07e---wapibisimisuxavuk.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/topowipeduzebedupe.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 19116 bytes
SHA-256: cdb132dd0046752d45992ff02bc73259a2885cb6b56c86685d2e095e2fa5cffd
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10608 bytes
SHA-256: 92a125cd326cb5719e3104104b5aad6cc1805af12f2ee28f662374e014a85ff8
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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