Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c03d86d0a131c7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-29 11:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97199f12d8e6fb2e6a1ed94008a4b12e SHA-1: 5bde7def3bc3ae8f86205aa88207f11452a60bc5 SHA-256: c8c03d86d0a131c7e58609a82ee63bcb123e9090a10e1c68e5293a82b68fc9d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s7tnrubvgo4i7u6352gsq6qk74/dututofor.pdf In PDF document text
    • http://vietsinphar.com/uploads/files/68282539456.pdfIn PDF document text
    • http://electric-kernbichler.at/3263068333.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/4269059581.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b022b72eb4---wexeruwobamosugebadil.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/16300422577.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/butetizixapomum.pdfIn PDF document text
    • http://evola.it/userfiles/files/votugebiliwawafikakumexew.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/xatog.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xiwazemaxeguzakupikil.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9f10883b---64232926592.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e581617ae9---foramavufidudira.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff87429b---73538697561.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8uko3fobe29pfgptrfcqvkq4bm/34764739910.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pagiwimerabin.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/98584406682.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/25739590119.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210928182109738323w1irin.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210928142421754092jbd9y.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/42905666107.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nisafumixuja.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210918213113.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/rizebakusanukeze.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/78573588338.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xixovisoparazak.pdfIn PDF document text
    • http://weingut-suppan.at/files/40422937836.pdfIn PDF document text
    • http://juha.be/_files/file/64649457233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=map+of+the+soul+pdfPDF 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_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 17540 bytes
SHA-256: a776417766b48d42b23aa4aa4243c90e173fd9ec0978fc434eb55cfd01df9c66
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10392 bytes
SHA-256: 8903436c81601b88614cf3ef0f067504a675a744348db73c084f80b3c82b46c0

Open this report in the interactive analyzer, or submit your own file for analysis.