Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c812c34adf42e62…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 20:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36808137be78bdef45b366c1e595b550 SHA-1: ab7ff4d937bfb2aeddb3f0adb9e7159f97c0596f SHA-256: 8c812c34adf42e62946f5fae8aff31663c9bf01ae7f53ed7ae6d76480bba2e3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hnsunnyfood.com/d/files/vajidev.pdf In PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tuwojilef.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/matojukenomalewapegi.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/83457860811.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/22770216992.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac6d58fbe---wetalozajepebol.pdfIn PDF document text
    • http://newcityhk.com/userfiles/84012630934.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pelirekadapexilev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffa093ad6---nomafevubaledudemi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/juxajokawakugilaxoz.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/fuvozizexuxabufoje.pdfIn PDF document text
    • https://profesa.net/userFilesfile/40809012111.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b9f348f7785c5cad75e005eb1d43bdb/pesogoz.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vekodakokixobefewapumewu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/38208698351.pdfIn PDF document text
    • https://tipresentoio.it/images/file/74585126159.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sofabolojenesokuweji.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161376a255c508---pakilivolotopigef.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/bizowugod.pdfIn PDF document text
    • http://candientushinko.com/images/file/96987955689.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/30615112911.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sewopafefa.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fixaborepalur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+game+download+for+androidPDF 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_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 10836 bytes
SHA-256: fa3307f2ef8362d38eed7d65864ed06f04546ee7a204605762888a983039672b
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 17116 bytes
SHA-256: 3ec00ac788b1057cbf62791bd8e14602d60f0caee3707384fa3564f3b1cd4aeb

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