Malicious PDF — malware analysis report

Static analysis result for SHA-256 651bec48f0db02c4…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 18:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93f654a32827005695db33213bc562d0 SHA-1: fdd8ecae4624b7406e2feb7b958fe299827aa815 SHA-256: 651bec48f0db02c4df0640814bdfe24f0db4121ae725c3c8c9379e8fa2dbd6e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2decf0653862b6a9419af11266049030/bapurawizi.pdf In PDF document text
    • https://valergences.fr/userfiles/file/rerebosusiwuworavef.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/wazonova.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff76dae3a4---nufoginodimememevafamewi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gafuwexeboxov.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/73955195215.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/phn7s3i9fnfs40l7d92rp5dt8m/zesefosejisusemur.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/82eff9e9c6eb252d0009d9f1b19ad5b7/24273123541.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/negexuvikexidamewabebi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8e86e8f32---56985524049.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/pumudipes.pdfIn PDF document text
    • http://goref.ru/files/file/9470346732.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612385570ce2f---67596109618.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/27829860654.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/56604294849.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/viwozoguxoneli.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0be50a8ba94702ae97f1242e94b5db36/megedewitanesi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/029d18dfd6f7e3af2bdeab7204812d53/saritufosevedifox.pdfIn PDF document text
    • http://coffee33.ru/archive/file/ratoluratuwepaxisizozu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/74353378284.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3bfa0294b5b68f0d9721c763dc0b1075/xapasurapegef.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gulubarutudezebenerul.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/52524868450.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/593b281cde8b27f7f9ae0d6fde2aa06d/dipeneriwo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd24cdab34---92420391116.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b28b824f8---takeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=estatistica+basica+sonia+vieira+pdf+downloadPDF 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_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 21516 bytes
SHA-256: 81202daf937d1a31a4515a00496af1d33a01442c883f05a4517acbdcc133834e
font_02_sfnt_off00015d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D77 10888 bytes
SHA-256: 4aaec9d3b95c81ade6627071facc256a55b9d8ee45e59ab6859a576812e483dc

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