Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87ddbd633b36ab…

MALICIOUS

PDF

78.7 KB Created: 2021-07-19 11:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e05e3508001acde10bc2931e39f9950 SHA-1: 521ec0b398b56d4e85e4a7abde8d0f9924d9be32 SHA-256: 7b87ddbd633b36ab5110458a510e02109c47849293916391c7a36228c0bcf59a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The embedded URLs and the overall structure suggest an attempt to lure victims to external sites for phishing or malware delivery.

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 https://mediaget.ru/userfiles/files/66897879681.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pidow.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea4657dadd095eab54b6745d0a6582c6/40483427584.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/sapizojoton.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/59577646040.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c25b6b1c---76194180264.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/38895809644.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/pivuwafokigazimitiru.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/zowowilesiz.pdfIn PDF document text
    • http://vodnik48.ru/content/file/63250682636.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lijiwiliwidijujizup.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ff9ed3abc5fa08b31436a2bad45a57fd/valipemaneme.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5137898a---daduzojuno.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/81935585972.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/kazopuvoveduzanixawad.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/xalixagezagemanekorowe.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/xulagekimixewemepunevi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/reqhpqfkqmd1ttmisq1gg6h60d/68543343703.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce387c4c7---63852569310.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/darabofizabuwe.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/50261753116.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2a582e695239ffc7b73495fe6c1f560f/fexafudal.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e42a2f64ea7aba2fd436b4812599ecab/96814575000.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e2baea8a635---tedot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=forest+and+environment+departmentPDF 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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 16832 bytes
SHA-256: 9977adf9109f4d1fab5212a75751f3632eb7bb7a643c7b43270af5b4e6d8e74c
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10548 bytes
SHA-256: 97a9264c9f283023563ec52add6315b3d5509032c2bc5bc89089011fbab2dcec
font_02_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1