Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdabb6f6f8c82b0…

MALICIOUS

PDF

95.9 KB Created: 2021-08-31 07:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0168a3cb4abcea45e2796f8f26a07036 SHA-1: 384b906ac03186805bed7e276b4935483ab7bd70 SHA-256: 8cdabb6f6f8c82b0c4d61612cd4faa95c0e1f5d5075a0c1550351733c33f1b83
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://strategieb2b.ca/userfiles/file/18501973797.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/55253702840.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/79054099677.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/lorunijefa.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc844ba9a8bb58286075b9776f1a4597/xisadanow.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/70833051129.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/65444117781.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gb95uhomo8t7elfbbpt8uri5nv/13401625003.pdfIn PDF document text
    • http://www.pactforfamilies.org/ckfinder/userfiles/files/mufigukuvalevumoda.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/80705337403.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae63292778b08a0a6f90f29f3e5f04b8/16639448111.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/finagujisinuwuv.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/93776699129.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4e70e897b7a3288ad82770cb19a8cb2/lovalek.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/7780359113.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780c03d2402---gagomemafoko.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b937665e0---julalomuzobixozezoxe.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/56698573285.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nojilugorubozimakara.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a9b21782---dejaponu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a016e33bf---97878001776.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/39835991871.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/19298579229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=novena+for+our+dearly+departedPDF link annotation
    • https://lapdonline.org/file/kulirosokizasa.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_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 10488 bytes
SHA-256: b8829772588f65f3f7be5c9cd67a62c1b0c6fddf23c955668e3ca0b0019a0463
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 18084 bytes
SHA-256: f4bdb47a7ddd237f3cc6bff0d4b6af77138e81d6e130e1dfcc71ce4a232b600c
font_02_sfnt_off000159cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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